Question

periodic table organization: how are elements arranged in the modern periodic table? what happens to the number of valence electrons as you move from left to right across the periodic table? what is a group? list 3 elements that are in the same group. what do members of a group have in common? what is a period? a horizontal row on a periodic

Explanation:

Elements are arranged by increasing atomic number. Valence - electrons increase left - to - right. A group is a vertical column. E.g., hydrogen, lithium, sodium have 1 valence electron.

Answer:

1. By increasing atomic number.
2. Increases.
3. A vertical column.
4. Hydrogen, lithium, sodium.
5. Same number of valence electrons.