Unit B 2.3

Question 1

How many elements are now on today and how are they organized?

Answer 1

There are about 118 elements. They are organized into the periodic table of elements

Question 2

What is an atomic number?

Answer 2

It shows the number of protons and electrons in one atom of the element

Question 3

What does atomic number equal?

Answer 3

Atomic number equals number of protons equals the number of electrons

Question 4

What is mass number?

Answer 4

The sum of the protons and nucleons in the nucleus of what action of the element

Question 5

What does mass number equal?

Answer 5

Mass number equals number of protons plus the number of neutrons. We round atomic mass to the nearest whole number

Question 6

What is atomic symbol?

Answer 6

The first letter or two of the Latin name for an element. Atomic symbols are used to distinguish the elements

Question 7

What are metals?

Answer 7

They tend to be shiny, malleable, ductile. They conduct electricity, and are solid at room temperature (except for mercury)

Question 8

What are nonmetals?

Answer 8

Nonmetals are solids or gases at room temperature with the exception of Bro mine. I was solid they are doll and brittle. They do not conduct heat or electricity very well except for carbon. They are in groups 14 to 16 on the periodic table

Question 9

What are metalloids?

Answer 9

They have both metal and nonmetal properties, some of them are semi conductors which means they can carry an electrical charge under certain conditions, and therefore are great for computers and calculators

Question 10

What are chemical families?

Answer 10

A term used to describe a group of related elements that have similar properties

Question 11

What are alkaline metals?

Answer 11

Group one on the periodic table, they do not occur in nature and are softer then most metals. They are very reactive and can even explode is exposed to water or air

Question 12

What are alkaline earth metals?

Answer 12

Group 2 on the periodic table, they are extremely reactive and are not found freely in nature, all react with water in the same manner but are not as reactive as the alkali metals

Question 13

What are halogens?

Answer 13

Group 17 on the periodic table, they are non-metallic elements, they are the most reactive nonmetals. Compounds that contain halogens are called salts

Question 14

What are noble gases?

Answer 14

Group 18 on the periodic table, they do not react with other elements and are the most stable element because all of them have the maximum number of electrons possible in their outer shell