Chapter 4

How many valence electrons does a fluorine atom have?

Give an example of an alloy.

How was Moseley's arrangement of the elements in the periodic table different from Mendeleev's?

What did the gaps on Mendeleev's periodic table represent?

Why was Mendeleev's periodic table accepted by most chemists?

What determines the horizontal arrangement of the periodic table?

Why is barium, Ba, placed in Group 2 and in Period 6\(?\)

Why is hydrogen in a class by itself?

All halogens are highly reactive. What causes these elements to have similar chemical behavior?

What property do the noble gases share? How do the electron configurations of the noble gases give them this shared property?