2. Atoms and the Periodic Table

Complete the following statements:

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

According to the table above, how many electrons are needed to have a combined mass of 1.0465 x 10^-25 kg?

How many atoms are contained in 0.230 g of sodium, Na? The mass of one sodium atom is 23.99 amu.

Identify each of the following as describing either a proton, a neutron, or an electron:

a. has the smallest mass

Would you use the atomic number, mass number, or both to determine each of the following?

d. number of electrons in a neutral atom

Would you use the atomic number, mass number, or both to determine each of the following?

c. number of particles in the nucleus

How many protons and electrons are there in a neutral atom of each of the following elements?

a. argon

Which statements completed with a to e will be true and which will be false?

An atom of N compared to an atom of Li has a larger (greater)

c. number of protons

Match the subatomic particles (1 to 3) to each of the descriptions below:

1. protons

2. neutrons

3. electrons

b. surround the nucleus

Indicate if each of the following statements is true or false:

c. The atomic mass unit is based on a carbon atom with six protons and six neutrons.

Indicate if each of the following statements is true or false:

d. The proton and the electron have about the same mass.

Complete the following statements:

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

Complete the following statements:

a. The number of protons and neutrons in an atom is also the _____ number.