An element has 2 electrons in its N shell. (i) What is its atomic number ? (ii) State its position in the periodic table. (iii) Is it a metal or nonmetal ? (iv) State the name assigned to this group.
To answer your questions:
(i) The number of electrons in an atom equals its atomic number. Since the element has 2 electrons in its N shell, its atomic number is 2.
(ii) With an atomic number of 2, the element is helium (He), which is positioned in the first group of the periodic table.
(iii) Helium is a nonmetal. Nonmetals are located on the right side of the periodic table.
(iv) The group to which helium belongs is called the noble gases or group 18. These elements are characterized by their stable electronic configurations and minimal reactivity.
Which of the following is likely to be least stable?
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Which of the following is not a Lewis acid?
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Which of the following is not a property of compounds?
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Which of the following is polar?
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Which of the following metals exists in their native state in nature?
A. (i) and (ii)
B. (ii) and (iii)
C. (ii) and (iv)
D. (iii) and (iv)
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