Question

11. There are three shells in the atom of an element . Its outer most shell contain three electrons .

Mass number of the element is 27

a) How many electrons and neutrons are there ?​

Answer 1

Answer:

Atoms of period 3 elements must: have full K shells (2 electrons in the first energy level) have full L shells (8 electrons in the second energy level)

Explanation:

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Answer 2

Answer:

electrons =13

neutrons =14

Explanation:

K shell can contain 2 electrons

L shell can contain 8 electrons and the outermost shell has three electrons

that is, total number of electrons=8+2+3 =13

Number of neutrons= mass no - atomic no

that is , 27-13 = 14

(atomic no is 13 ,because no of electrons =13)(for neutral atom only, atomic no= no of electrons and no of protons)

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