Question

the three main groups of elements are metals, non - metals, and

1. a. inert gases

b. alkali metals
c. radioactive isotopes
d. metalloids

1. most elements are

a. metals
b. non - metals
c. metalloids
d. shiny

1. most nonmetals are

a. brittle
b. good conductors
c. metalloids
d. shiny

1. how do you know that potassium is highly reactive?

a. it conducts heat
b. it conducts electricity
c. it is soft and shiny
d. it has one valence electron on its outer shell

1. the order of elements in the periodic chart is based on the elements

a. atomic number
b. atomic mass
c. name
d. chemical symbol

Explanation:

1. Metals are the largest group of elements.
2. Non - metals are generally brittle.
3. Elements with one valence electron are highly reactive as they easily lose that electron.
4. Elements in the periodic table are arranged by atomic number.

Answer:

1. a. metals
2. a. brittle
3. c. It has one valence electron on its outer shell
4. a. Atomic number