Respuesta :

marwa28
The amount of protons are equal to number of electrons.
The element is K since there 19 protons and electrons

Answer : The number of protons in atom X is equal to 19.

Explanation :

Atomic number is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

As we are given that:

Atomic number of atom X = 19

Mass number of atom X = 39

As, Atomic number = number of protons = number of electrons

So, Number of proton in atom X = Atomic number of atom X = 19

Hence, the number of protons in atom X is equal to 19.

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