UNIT 2 VOCAB

Question 1

atomic theory

Answer 1

1. An element is composed of tiny particles called atoms.
2. In an ordinary chemical reaction, atoms move from on substance to another, but no atom of any element disappears or is changed into an atom of another element.
3. Compounds are formed when atoms of two or more elements combine.

Question 2

atom

Answer 2

the smallest particle of an element that can enter into a chemical reaction

Question 3

electrons

Answer 3

negatively charged particles

Question 4

nucleus

Answer 4

center of an atom made up of protons and neutrons

Question 5

proton