The atomic numbers of elements P, Q, R, S and T are given below.
Element. P Q R S T
Atomic number 7 10 12 4 19
From the above table, answer the following questions.
(a) Which element among these is a non-metal ?
(b) Which element belongs to 3rd period of periodic table
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Answer:
a. p and t
b. r
Explanation:
by using S p d f. electronic configuration in which S contain 2 electron p contain 6 electron and d contain 10 f contain 14 electron
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