An atom of potassium-37 and an atom of potassium-42 differ in the total number of a-positrons b-neutrons c-electrons d-protons

Answer : The correct option is, Neutrons.

Explanation :

The given atoms are, and

As from the periodic table, the atomic number of potassium is, 19

In ,

Atomic mass number = 37

Atomic number = 19

Atomic number = Number of electrons = Number of protons = 19

Number of neutrons = Atomic mass number - Atomic number = 37 - 19 = 18

In ,

Atomic mass number = 42

Atomic number = 19

Atomic number = Number of electrons = Number of protons = 19

Number of neutrons = Atomic mass number - Atomic number = 42 - 19 = 23

From this we conclude that the number of protons and electrons are same in given atoms but the number of neutrons are different.

Hence, an atom of potassium-37 and an atom of potassium-42 differ in the total number of Neutrons.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;