Question

periodic table review

1. the periodic table has a great deal of information about every atom. using your periodic table, answer the following questions:

a. what is the atomic number of chlorine (cl)? ____
b. how many protons are there in any cl atom? ____
c. what is the atomic number of tungsten (w)? ____
d. how many protons are there in any w atom? ____

Explanation:

Part a

Step 1: Recall atomic number definition

The atomic number of an element is the number of protons in its nucleus, and it's unique to each element. For chlorine (Cl), we refer to the periodic table.

Step 2: Find Cl on periodic table

Looking at the periodic table, chlorine (Cl) has an atomic number of 17.

Step 1: Recall proton - atomic number relation

The number of protons in an atom is equal to its atomic number.

Step 2: Use Cl's atomic number

From part a, chlorine (Cl) has an atomic number of 17, so the number of protons in a Cl atom is equal to its atomic number.

Step 1: Recall atomic number definition

The atomic number is the number of protons in the nucleus of an atom of an element. For tungsten (W), we refer to the periodic table.

Step 2: Find W on periodic table

Looking at the periodic table, tungsten (W) has an atomic number of 74.

Answer:

17

Part b