Question

Three elements A, B, C have atomic numbers 4, 12 and
19 respectively.
(i) Which of the two elements are having the same
number of valence electrons?
(ii) What is the electronic configuration of the other
element?
(iii) Name the isotope of hydrogen which does not have a
neutron.

Answer 1

Answer:

1) elements having atomic number 4 and 12

2) 2,2

2,2,6,2

2,2,6,2,6,1

3)H - protium

Explanation:

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