Question

Complete the following statement: $(4.2,4.3)$

a. The atomic number gives the number of _______ in the nucleus.

b. In an atom, the number of electrons is equal to the number of _______.

c. Sodium and potassium are examples of elements called________.

Short answer

a. Protons.

b. Protons.

c. Alkali metals.

Step-by-step solution

Part (a) step 1: Given Information

We need to complete the statement is the atomic number gives the number of _______ in the nucleus.

Part (a) step 2: Explanation

Now,

The atomic number gives the number of protons in the nucleus.

Part (b) step 1: Given Information

We need to complete the statement is in an atom, the number of electrons is equal to the number of _______.

Part (b) step 2: Explanation

Here,

In an atom, the number of electrons is equal to the number ofprotons.

Part (c) step 1: Given Information

We need to complete the statement is sodium and potassium are examples of elements called________.

Part (c) step 2: Explanation

Here,

Sodium and potassium are examples of elements called alkali metals.