Question

What do elements in the first two columns of the periodic table have in common?
a.They have two valence electrons.
b.They tend to lose electrons to gain stability.
c.They react strongly with the alkali metals.
d.They do not react with halogens.

Answer 1

They tend to form cations, with a +1 charge for the alkali metals, and a +2 charge for alkaline earth elements.

Answer 2

Which best explains why the noble gases are chemically unreactive?
a.They have no valence electrons.
b.They have the same number of protons and electrons.
c.They have more neutrons than protons.
d.They have very stable outer electron shells.

Answer 3

Which answer would you select?

Answer 4

C?

Answer 5

No, that is not the correct answer. Noble gases have filled outer electron shells, making them very stable.

Answer 6

Which of the following explains why elements in column 17 (the halogens) are very reactive?
A.Their atoms contain three energy levels.
B.Their atoms need only one electron to complete their outer energy level.
C.Their atoms have large masses.
D. Their atoms contain the same number of protons as electrons.
Would the answer be, B?

Answer 7

Yes.

Answer 8

Thank you for your help!

Answer 9

You're welcome.