Answer:
All the members of a group of elements have the same number of valence electrons and similar chemical properties.
Explanation:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.
Answer:
if you add a neutron to lithium-7 it becomes a compound nucleus of lithium-8
graphite is a form of carbon in which carbon atoms are arranged in a layer.
Answer:
Heat is something you can't control
Explanation:
Plastic is something you could control like moving it around
