In period 2, as the elements are considered from left to right, there is a decrease (1) ionization energy (2) atomic mass (3) metallic character (4) nonmetallic character (3) metallic chapter because Order these elements from greatest to least according to atomic radius and ionic radius. 28. ... €€€€ Identify the element in Period 2 that has the highest first ionisation energy and give its electron configuration. Element 43 (technetium), element 61 (promethium), and most of the elements with atomic number 84 (polonium) and higher have their atomic mass given in square brackets. 23. 4. It is also the 11th most common element in the human body: fifty percent of magnesium ions are found in bones, and it is a required catalyst for over three hundred different enzymes. 6. Aatomic mass Batomic number Cmolar mass Doxidation number 1.The elements on the Periodic Table are arranged in order of increasing ABr, Ga, Hg BCr, Pb, Xe CO, S, Se DN, O, F 2.Which list includes elements with the most similar chemical properties? Helium is in the first period and has 2 valence electrons, so its valence shell is full → monatomic A. Na B. Si C. Cl D. Ar 20. Which element in Period 5 of the Periodic Table is a transition element? That’s good . The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. L is in period 2. The group and period to which this element belongs to is (a) 2nd group, 3rd period (b) 2nd group, 2nd period (c) 3rd group, 2nd period (d) 3rd group, 3rd period _____ Name the elements that have many properties like iron. 12 neutrons, metallic, 11 electrons 8. Identify the element that has more valence electrons than fluorine and fewer energy levels than sodium. Which of the following period 3 elements has the least metallic character? G has 7 electrons. This list contains the 118 elements of chemistry. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. Identify the Lanthanide with the least mass. (d) €€€€A sample of element R contains isotopes with mass numbers of 206, 207 and 208 in a 1:1:2 ratio of abundance. The number given is the number of valence electrons. 21. Get essential facts about the first 20 elements, all in one convenient place, including the name, atomic number, atomic mass, element symbol, group, and electron configuration.If you need detailed facts about these elements or any of the higher numbered ones, start with the … The least massive of all elements is A. Identify a metalloid with 5 valence electrons. Hydrogen has 1 proton and 1 electron . The charges become stronger and stronger, and so the electrons are attracted closer and closer to the nucleus. 17 7. Which element in Period 3 has the greatest tendency to gain electrons? Chemical Properties of Period 2 Elements. In sodium, you only have one valence electron, which is shielded by the core electrons in the 1s2,2s2,2p6 shells. Question: 1) The element magnesium has 2 valence electrons. Element Symbol Atomic Number Period Group Sodium Na 11 3 1 O Krypton 79 5 12 4 7 M 5. 22. $ 1. It is the 8th most abundant element in the Earth's crust, constituting 2% by mass. 20. By signing up, you'll get thousands of step-by-step solutions to your homework questions. The first row has been completed as an example. What is the most likely charge on a magnesium ion? click on any element's name for further information on chemical properties, environmental data or health effects.. Examples. The element which has least tendency to lose electron is (a) H (b) Li ... (c) He. Sources, facts, ... A mass spectrometer has been used to confirm that astatine behaves chemically like other halogens, ... which has a half life of about 71/2 hours and it neatly filled the gap in the periodic table just beneath iodine. 2. atomic mass 3. atomic no. Atomic size reduces as we go from left to right in a period. ... it has the greatest atomic mass. Nonmetallic, period 3, atomic mass 32 Who Am I? Element Astatine (At), Group 17, Atomic Number 85, p-block, Mass [210]. A)atomic mass B)atomic radius C)electronegativity D)first ionization energy 13.As the elements is Period 3 are considered in order of increasing atomic number, there is a general decrease in A)Fe B)Mg C)Si D)Zn 14.An atom of which element has the largest atomic radius? Period 2, atomic mass 11 5. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The mass 2 isotope, which has a nucleus of one proton and one neutron and has been named deuterium , or heavy hydrogen (symbol D, or 2 H), constitutes 0.0156 percent of the ordinary mixture of hydrogen. Answer to: What elements in period 2 are nonmetals? Since helium is to the right of hydrogen it;s size is lesser than hydrogen . An element has 12 protons. An element X has mass number 40 and contains 21 neutrons in its atom. _____ _____ _____ _____ Using the Periodic Table Fill in the chart below. Neon is an exception because, being a group 18 (Noble Gas) element, it already has a stable electronic configuration. (i)€€€€€€Calculate the relative atomic mass of R. Give your answer to one decimal place. 24. C has an atomic mass of 5 and forms the compound CI. Elements in this group tend to lose 2 electrons and include the elements magnesium and barium. answer choices Identify the element that has 5 valence electrons and 2 energy levels. With the exception of neon, period 2 elements react in order to achieve a stable "octet" of electrons in their valence shells. Metal atoms form metallic bonds and exist as large continuous lattice structure. Silicon (Si)- it is a metalloid, and thus has some properties of a nonmetal. { a)Sr, b)Ag, c)Sb, d)Xe } { a)Si, b)Al, c)Na, d)Mg } Ag Which element in period 5 of the periodic table is a transition element? A) electron B) nucleus C) neutron D) proton 3) silicon sodium nitrogen potassium Use the periodic table to predict which element is nonmetallic AND a gas at room temperature. The Group 17 element with the highest electronegativity is (A) fluorine (C) bromine (B) chlorine (D) iodine (B) [Ne]3 s 2 (D) [Ar]3 d 10 4 s 2 4 p 6 19. C. oxidation number D. mass number 19. But, density is mass per unit volume. As the elements of Group 1 on the Periodic Table are considered in order of increasing atomic radius, the 8. _____ C. To which group does iron belong? Y 3. Compound X contains 69.2% indium and 1.8% hydrogen by mass. Z 2. Remember, Metals are to the left, and non-metals are to the right. ( it is on that "stair" divider between metals and nonmetals) Na (Sodium) and Mg (Magnesium) are on the left side of the Periodic table, while Al (Aluminum) is slightly in the middle. In the same period, as you add more electrons to the shell, you also have more protons. 29 electrons, period 4 9. Osmium (and iridium) have a very small atomic radius, so the mass is packed into a small volume. 4. Period 2 elements involve the 2s and 2p orbitals.They include the biologically most essential elements besides hydrogen: carbon, nitrogen, and oxygen. So, if an atom has unpaired valence electrons, it will form one or more covalent bonds with another atom which also has unpaired valence electrons to form an octet. Assuming osmium has the highest density, you might be wondering why elements with a higher atomic number aren't denser. 11. in the outer shell of all the elements in a group is the same as the group number. To which period does iron belong? Period 9. increases, decreases 10. right. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. In your answer, include at least six particles of each type. As the elements of Period 2 are considered in succession from left to right, there is a general decrease in A. ionization energy B. electronegativity C. metallic character D. nonmetallic character 21. B. This is a list of chemical elements, sorted by atomic mass (or most stable isotope) and color coded according to type of element.Each element's atomic number, name, element symbol, and group and period numbers on the periodic table are given. The answer is helium . Lithium (Li) is the lightest metal and the least dense solid element. it has the greatest number of protons, ... Electronegativity _____ from left to right within a period and _____ from top to bottom within a group. 1. Atomic mass 20, gas 10. period 5, transition element, 51 neutrons Who Am I? After all, each atom weighs more. All of the following elements have 3 energy levels. This is done for elements that consist entirely of unstable, radioactive isotopes (you will learn more about radioactivity in the nuclear chemistry chapter). the 4th period that is more reactive than Calcium. Chemical elements listed by atomic mass The elements of the periodic table sorted by atomic mass. W has the largest mass. 26 protons, period 4, transition element 7. Why Osmium Is Densest When Heavier Elements Exist . B has the smallest mass. H 4. atomic radius: chlorine, ... Matter is anything that has mass … We hope the given MCQ Questions for Class 10 Science Periodic Classification of Elements with Answers will help you. Why ? a. the element in period 2, group 1; or the element in period 3, ... a plastic containing a compound of the elements chlorine, carbon, and oxygen. 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