Chapter 42: Q. 1 Exercise (page 1235)

How many protons and how many neutrons are in $(a) {}^{6}{Li}, (b) {}^{54}{Cr}, (c) {}^{54}{Fe}, and (d) {}^{220}{Rn} ?$

Short Answer

Expert verified

Therefore,

a.) 3

b.) 30

c.) 28

d.) 134

Step by step solution

Given information

$(a) {}^{6}{Li}, (b) {}^{54}{Cr}, (c) {}^{54}{Fe}, and (d) {}^{220}{Rn} ?$

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

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

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

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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How many protons and how many neutrons are in $(a) {}^{6}{Li}, (b) {}^{54}{Cr}, (c) {}^{54}{Fe}, and (d) {}^{220}{Rn} ?$

Short Answer

Step by step solution

Given information

Explanation (a)

Explanation (b)

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Explanation (d)

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

Short Answer

Step by step solution

Given information

Explanation (a)

Explanation (b)

Explanation (c)

Explanation (d)

One App. One Place for Learning.

Most popular questions from this chapter

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How many protons and how many neutrons are in $(a) {}^{6}{Li}, (b) {}^{54}{Cr}, (c) {}^{54}{Fe}, and (d) {}^{220}{Rn} ?$