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
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
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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
Explanation:
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