5-1 & 5-2 Practice

Horizontal (SIDE TO SIDE) rows on the periodic table are

• groups

• periods

Answer explanation

Horizontal rows on the periodic table are called periods. Each period represents a different energy level of electrons in the atoms of the elements in that row.

How many energy levels does Au have? Just give me the number.

Answer explanation

Gold (Au) has 6 energy levels, corresponding to its electron configuration. Therefore, the correct answer is 6.

How many energy levels does O have? Just give me the number.

Answer explanation

Oxygen (O) has 2 energy levels. The first level can hold 2 electrons, and the second can hold up to 8. Therefore, the correct answer is 2.

How many energy levels does Rb have? Just give me the number.

Answer explanation

Rubidium (Rb) has 5 energy levels, corresponding to its position in the periodic table as an alkali metal in group 1. Each energy level can hold a certain number of electrons, contributing to its chemical properties.

How many energy levels does He have? Just give me the number.

Answer explanation

Helium (He) has 1 energy level. The question's correct answer is 0, which is incorrect. Helium has two electrons in its first energy level, making the correct number of energy levels 1.

How many energy levels does Cm have? Just give me the number.

Answer explanation

Curium (Cm) has 7 energy levels. The correct answer is 7, not 0. Each element's energy levels correspond to its position in the periodic table, and Cm is located in the actinide series.

How many energy levels does Xe have? Just give me the number.

Answer explanation

Xenon (Xe) has 5 energy levels, corresponding to its electron configuration. Therefore, the correct answer is 5.

H and He have the same number of energy levels.

• True

• False

Answer explanation

H (Hydrogen) and He (Helium) both have one energy level, as they are both in the first period of the periodic table. Therefore, the statement that they have the same number of energy levels is True.

P and Po have the same number of energy levels.

• True

• False

Answer explanation

The statement is false because phosphorus (P) has 3 energy levels, while polonium (Po) has 6 energy levels. Therefore, they do not have the same number of energy levels.

what period would this element be in?

• 6

• 8

• 3

• 16

Answer explanation

The element is in period 3 of the periodic table, which includes elements with atomic numbers 11 to 18. Therefore, the correct answer is 3.