Question

Which one of the following tells the physical state (matter) of an element at room temperature?

A. Atomic number
B. The color of the chemical symbol
C. Atomic mass
D. Element name
Which of the following elements is the most reactive?
A. K
B. Kr
C. Fe
D. Cu
Which of these elements is least metallic?
A. K
B. Kr
C. Fe
D. Cu
Which of these groups are all nonmetals?
A. K, Ca, Sc
B. Se, Br, Kr
C. V, Cr, Mn
D. As, Se, Br

Answer 1

Use the periodic table.

Answer 2

The first one is B and the last one is D I'm pretty sure but I don't know the other two off the top of my head. Hope this helps:)