Question

There are three shells and 5 electrons are present in the outermost shell of an atom.
a) Write the electronic configuration?
b) What is its atomic number?
c) Suggest the group and period of the element?

Chemistry standard 9​

Answer 1

Answer:

a)electronic configuration = 2,8,5

b) atomic no. = 15

c) the element is phosphorus(please refer to periodic table for group and period)

thank you

Answer 2

Answer:

1. 2 8 5
2. 15
3. group 15 period 3

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