Vertical Column is a group
Horizontal is Period
Aliki earth metals is a group
Lithium- Neon is both
Based on electrons are both
Number of electron shells is both
Pipes are made of the element Lead so the answer should be d) lead pipe
you calculate all the letters together and it would be Zn2
Acid rain falls in areas that have air pollution. (<span>Acid rain is caused by emissions of </span>sulfur dioxide<span> and </span>nitrogen oxide)
Mechanical energy of the firefighter moving