Question

1. lf one atom of an element contains 20 neutrons and 20 protons then what is the mass number of that atom?
a 37
b 40
c 30
d 50

2. which of the following two atoms have same mass numbers?
a Mg and Al
b Ca and Cl
c P and Ar
d Ar and Ca

please answer these questions correctly​

Answer 1

Answer:

1

mass of atom is sum of neutron and proton

so it's mass will be 40u

2

Ar and Ca is the answer

they have 40u mass

Answer 2

Explanation:

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