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Chapter 42: Q. 1 Exercise (page 1235)

How many protons and how many neutrons are in(a)Li6,(b)Cr54, (c)Fe54, and (d)Rn220?

Short Answer

Expert verified

Therefore,

a.) 3

b.) 30

c.) 28

d.) 134

Step by step solution

01

Given information

(a)Li6,(b)Cr54, (c)Fe54, and (d)Rn220?

02

Explanation (a)

The nucleus is made up of Z protons and A - Z neutrons, as we know.

a.) We have 6Li

Atomic number is: 3

Number of protons is: 3

So, number of neutrons for 6Li is: 6-3 = 3

03

Explanation (b)

b.) We have 54Cr:

Atomic number is: 24

Number of protons is: 24

So, number of neutrons for 54Cr is 54-24 = 30

04

Explanation (c)

c.) We have 54Fe

Atomic number is: 26

Number of protons is: 26

So, number of neutrons for 54Fe is 54-26 = 28

05

Explanation (d)

d.) We have 220Rn

Atomic number is: 86

Number of protons is: 86

So, number of neutrons for 220Rn is 220- 86 = 134

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