Question

Identify the group of elements with the same outermost energy level

a)H, He

b)N, P, As, Bi

c)Rb, Sr, Y, Zr

d)B, Si, As, Te, At

Answer 1

Answer:

A

Explanation:

Answer 2

b) N, P, As, Bi

• Elements in the same group all have the same number of valence electrons and therefore similar chemical properties.
• Valence electrons help in predicting chemical reactions.
• So all the atoms of a given element have the same energy levels because they have the same numbers of electrons and protons.

• N, P, As, Bi for this group of elements, all these elements belongs to same group i.e. group 15.

• Group 15 has total 5 valence electrons.

• Electronic configuration = ns²np³
• All these elements will have same outermost energy level.

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