Question

1. What are the horizontal rows of the periodic table called?

2. Which sublevel is being filled in period 1?
3. Which sublevel is being filled in period 7?
4. How does the electron configuration of an element give information about the period it is in?
5. What block of elements has the d sublevels being filled?

Answer 1

I got you.

1. The horizontal rows of the periodic table are called periods.
2. In period 1, the 1s sublevel is being filled.
3. In period 7, the 7p sublevel is being filled.
4. The electron configuration of an element gives information about the period it is in by showing which energy level the valence electrons are in, and how many electrons it has in each energy level.
5. The block of elements that has the d sublevels being filled is the transition metals.

Answer 2

1. Period
2. 1S sublevel
3. 7s 5f 6d 7p