Tom Jackson’s “The Elements”
Using the following portion of the periodic table of elements shown, answer the questions below:
1. What do the element symbols, H, Li, Na, and K have in common?
- The symbols, H, Li, Na, and K are all in the same column (group). The groups are numbered from 1 through 18. These symbols are all in Group 1.
- Elements in Group 1 have one valence electron.
FYI: Valance electrons are the electrons in an atom’s outermost energy level.
FYI: The Group number is not always equal to the valence electrons, but it gives clues for the elements in that group. See PERIODIC TABLE GROUPS.
- Elements in Group 1 are very metallic.
- Elements in Group 1 tend to lose their one valence electron during a chemical reaction forming cations (positively charged particles) with a 1+ charge.
2. What do these element symbols, Li, Be, B, C, N, O, F, and Ne have in common?
- The symbols, Li, Be, B, C, N, O, F, and Ne are all in the same period (row). The periods are numbered from 1 through 7. The symbols Li, Be, B, C, N, O, F, and Ne are all in period 2.
- Elements in period 2 all have two energy levels surrounding their nucleus. The period number always equals the number of energy levels that the atoms of an element in that period have.
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