Which element has the greatest first ionization energy? B

C

Be

Li

Which statement is true about the ionic size of the elements in a group as one moves from bottom to top in that group?

Ionic size decreases from bottom to top within the group.

Ionic size increases from bottom to top within the group.

Ionic size does not vary in any predictable way within the group.

Ionic size stays the same within the group.

helium

Explanation:

The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

just did the assignment and the answer was #1 +2 n

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