An element has its electron configuration as 2,8,2. Now answer the following questions:
a. What is the atomic number of this element?
→ Atomic Number (Z) = 2 + 8 + 2 = 12.
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b. What is the group of this element?
→ This element belongs to Group 2.
(∵ The outermost shell of this element has 2 electrons)
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c. To which period does this element belong?
→ This element belongs to Period 3.
(∵ The number of electron shells in the atom is 3)
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d. With which of the following elements would this element resemble? (Atomic numbers are given in the brackets)
N (7), Be (4) , Ar (18), Cl (17)
→ Among the given elements, this element would resemble Be (4).
(∵ The electronic configuration of Be is 2,2. The number of electrons present in the outermost shell is 2. Hence, Be also belongs to the group 2.)
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This page was last modified on
30 July 2019 at 03:18