7th grade atoms

Question 1

Families on the pt share the same number of

Accepted Answer

valence electrons

Question 2

The smallest particle in which a substance can be divided and still be the same substance is

Accepted Answer

an atom

Question 3

A chemical _______ is an abbreviation for an element

Accepted Answer

symbol

Question 4

What determines how reactive ( chemically) an atom will be

Accepted Answer

its electrons

Question 5

The atomic number tells you the number of _______ and _____ in the nucleus

Accepted Answer

protons and electrons

Question 6

The 3 main particles in an atom are:

Accepted Answer

protons,neutrons, electrons

Question 7

He proposed the atomic theory

Accepted Answer

John Dalton

Question 8

periods on the pt have the same number of

Accepted Answer

energy levels

Question 9

A vertical column on the periodic table is a

Accepted Answer

family

Question 10

What is the term used for the outermost energy level of electrons?

Accepted Answer

valence electrons

Question 11

Who believed atoms were made of hard particles of different shapes and sizes?

Accepted Answer

Democritus

Question 12

What happens when a positive ion and an negative ion are attracted to each other?

Accepted Answer

a bond forms

Question 13

A horizontal row on the periodic table is a

Accepted Answer

period

Question 14

Protons and Neutrons are found in the

Accepted Answer

nucleus

Question 15

He showed electrons moved around the atom in energy levels

Accepted Answer

nails bohr

Question 16

The rule than an atom wants 8 elections in it's energy level is called the

Accepted Answer

octet rule

Question 17

Atoms of the same element that have the same # of protons but different # of neutrons

Accepted Answer

isotopes

Question 18

The electrons float around the atom in the:

Accepted Answer

electron cloud

Question 19

Name this compound NaI

Accepted Answer

sodium iodide

Question 20

Name this compound SO3

Accepted Answer

sulfur trioxide

Question 21

Elements tha have properties of both metals and non metals are called

Accepted Answer

metalloids

Question 22

The fact that all substances are made of atoms and atoms cannot be created or destroyed is

Accepted Answer

the atomic theory

Question 23

When an atom gains or loses an electron it is called

Accepted Answer

an ion

Question 24

Atoms of the same element are exactly

Accepted Answer

alike

Question 25

How many atoms does a molecule of h2o have?

Accepted Answer

3

7th grade atoms

Questions 25

7th grade atoms

Questions 25