Please help 1-Name the elements in gp1.
2-Why are these elements placed in gp1?
3-Mention the trends in atomic size, atomic number, mass number, reactivity, boiling & melting points.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

Find the missing probability in the table below a.0.10 b.40 c.0.80 d. 0.20

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid