1.2

Question 1

element

Answer 1

a pure substance that can not be broken down into any simpler substance

Question 2

compound

Answer 2

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

Question 3

atom

Answer 3

the smallest unit in an element that retain the properties

of that

Question 4

proton

Answer 4

a particle in the nucleus of an atom one unit that carries

one unit of positive electric charge

Question 5

neutron

Answer 5

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

Question 6

electron

Answer 6

a particle in the space outside the nucleus charges of an atom that carries one unit of negative electric

Question 7

nucleus

Answer 7

1 a dense structure inside the cell. 2 One of the airborne
dust particles around which water condenses as droplets
or ice crystals before falling as precipitation.3 An atom’s dense center, where most of its mass is

Question 8

molecule

Answer 8

A particle that contains more than one atom joined together