Position in the periodic table.

Chemistry

1 answer:

Nikolay [14]3 years ago

4 0

Answer:

1)A period in the periodic table is a horizontal row. All elements in a row have the same number of electron shells. ... Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases both as you move down a group or across a period.

2)D)Na has one fewer valence electron than Ca.

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