List the five statements in daltons atomic theory

1. All matter is composed of atoms. Atoms cannot be destroyed or created.

2. All atoms of different elements are different in properties.

3. All atoms of the same element are identical in properties.

4. During a chemical reaction, no atoms are created or destroyed. The atoms are rearranged.

5. Compounds are formed by the combination of two different atoms with same ratio.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.