Question

describe the trends in electron configuration in the periodic table by selecting the terms from the drop-down menus.
the number of valence electrons from the left to right across a period.
the number of valence electrons from the top to the bottom of a group.
electrons are added into the outermost in groups 1 and 2.
electrons are added in the outermost in groups 3 through 12.
electrons are added in the outermost in groups 13 through 18.
done

d orbital
p orbital
s orbital

Explanation:

1. Across a period, each element gains one proton and one valence electron, so valence electrons increase.
2. Elements in the same group have the same number of valence electrons, so they stay constant down a group.
3. Groups 1 and 2 are the s-block, so electrons fill the outermost s orbital.
4. Groups 3-12 are the d-block, so electrons fill the outermost d orbital.
5. Groups 13-18 are the p-block, so electrons fill the outermost p orbital.

Answer:

1. The number of valence electrons increases from the left to right across a period.
2. The number of valence electrons stays constant from the top to the bottom of a group.
3. Electrons are added into the outermost s orbital in Groups 1 and 2.
4. Electrons are added in the outermost d orbital in Groups 3 through 12.
5. Electrons are added in the outermost p orbital in Groups 13 through 18.