Question

atom has mass number of 238 and atomic number of 92 and atom B

has mass number 235 and atomic number 92

a) How many protons in A & B atoms

b) How many neutrons in A & B atoms

c) Are A and B isotopes or isobars Explain​

Answer 1

Correct Question:

Atom A has mass number of 238 and atomic number of 92 and atom B has mass number 235 and atomic number 92.

Answers:

a) How many protons in A & B atoms?

Ans.a) Number of protons = Atomic Number

In A atom,

Atomic Number = 92

Number of protons = 92

In B atom,

Atomic Number = 92

Number of protons = 92

b) How many neutrons in A & B atoms?

Ans.b) Number of neutrons = Mass number - Number of protons

In A atom,

Number of neutrons = 238 - 92

= 146

In B atom,

Number of neutrons = 235 - 92

= 143

c) Are A and B isotopes or isobars? Explain.

A and B are isotopes because they are having same atomic number (i.e; 92)

Answer 2

Answer:

a) protons in A is 92 and B is 92

b) neutrons in A is 146 and B is 143

c) A and B are isotopes

reason:

1. no. of protons or electrons is equal to the atomic number.

2. no. of neutrons is the difference between mass number and atomic number.

3. isotopes: they are elements with same atomic number but different mass number.

isobars: they are elements with different atomic number but same mass number.

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