Question

An element have electrons 19 find its atomic no.?

Answer 1

Answer:

The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

Answer 2

(a) The element with atomic number 19 is potassium (K). Its electronic configuration is 2, 8, 8, 1.

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