1. How isotopes of copper are Cu-63 and Cu-65. How are these two isotopes the same? How are they different? 2. What is an isotope?

3. Why do elements in the same group have similar chemical properties?

4.What are valence electrons?

5.Write the symbol for each of the following elements:
The halogen in period three
The alkali metal in period two
The noble gas in period one
The alkaline earth element in period six
Any transition metal in the 5th period
A metaloid in group 14
A nonmetal in group 16

6. What are two differences between a metal and a nonmeta

PLEASE ASAP