lesson 2 Elements and compounds

Question 1

element

Answer 1

A pure substance that cannot be broken down into any simpler substances.

Question 2

compound

Answer 2

Any substance that is formed by the chemical combanation of two or more elements and acts like a single substance

Question 3

atom

Answer 3

The smallest unit of an element that retains the properties of that element

Question 4

proton

Answer 4

A particle in the nucleus of an atom that carries one unit of positive electric charge.

Question 5

neutron

Answer 5

A particle in the nucleus of an atom that has no net electric charge

Question 6

electron

Answer 6

A particle in the space out-side the nucleus of an atom that carries one unit of negative electric charge.

Question 7

nucleus

Answer 7

A dense structure inside the cell. One of the airborne dust particles around witch water condenses as droplets or ice crystals before falling as precipitation. An atoms dense center, where most of it’s mass is.

Question 8

molecule

Answer 8

A particle that contains more that one atom joined together