Using your periodic table if you look at it 3-11 are tansition metals so the horizontal Group Number will help if the group number has to digits just remove the one so if it were to be 13, the valence would be 3, if it were 14 the valence would be ,4 if it were 15, the valence would be 5, if it were 16 the valence would be 6, if it were 17 the valence would be 7 if it were group 18 the valence would be 8 so if anymore help needed to explain hit me up
iron, cobalt and Nickel is the answer
1.COVALENT BOND [c] 2. Ionic bond [d] 3. Ionic bond [d] 4. a reaction where energy is released [b] 5. 2FE2C03=4FE=3CO2 [a] 6. The mass of reactant must be equal to the number of mass of the product [a] 7. Valence electrons [a] 8. Atomic number [a] 9. combustion [c] 10. More nitrogen in the nitrogen cycle [a]
The answer is b increases in increase of mass because the heavier the object is the more gravitional pull it will have. For example, what will fall faster? A 1 pound object or a 10 pound obect.