Question

an atom of an element contains 20 protons 20 neutrons 20 electron. the element is​

Answer 1

Answer:

Calcium

Explanation:

calcium has 20 electrons, protons, neutrons

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Answer 2

Answer:

atomic number = number of electron Or proton.=20

Atomic mass =number of electron Or proton+number of neutron = 40

atomic configuration according to K L M N

2 8 8 2

and according to s p d f ar 4s^2

valency =2

Explanation:

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