Sodium (na) and chlorine (cl) combine together to form table salt (sodium chloride). looking at the periodic table, which element would you predict could sodium combine within a way most similarly to chlorine?

a. iodine (i)
b. argon (ar)
c. potassium (k)
d. magnesium (mg)

A. Iodine (falls in the same group as chlorine)

Explanation:

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles