Science 5.1 - 5.2

How many valence electrons do elements in Group 2, the Alkaline Earth Metals, have?

2

How many valence electrons do most atoms need to have a complete outer shell and be happy?

8

Why does an ion have a charge (be specific)?

An ion has a charge because it either has more electrons or more protons.

Which two elements only need two valence electrons to be happy?

Hydrogen and Helium

How do ions form?

Ions form when the atom loses or gains electrons

Complete the chart: Group Number (Main Groups Only) 13 14 15 16 17 18

Number of Valence Electrons 3 4 5 6 7 8

Why are ionic compounds electrically neutral?

The charges cancel each other out.

How do ionic bonds form?

They form between two oppositely charged ion come together and make it neutral.

Why do the elements you named in #5 only need two valence electrons?

They only have one shell

Which part of the atom is responsible for chemical bonding?

electrons

What are valence electrons(be specific)?

electrons that have the highest energy and determine the atom's properties.

If an element gains an electron, will it form a positive ion or a negative ion?

negative

If an element gives away an electron, will it form a positive ion or a negative ion?

positive

What is the rule for finding out how many valence electrons elements in groups 13-18 have?

subtract ten from the group number

Where are valence electrons located (be very specific)?

they're in the outer most shell of the atom

How many valence electrons do elements in Group 1, the Alkali Metals, have?

1