All About The Atom

Question 1

Which best describes the current model for how electrons move in an atom?

Accepted Answer

They can be anywhere in the electron cloud.

Question 2

Electrons in the sphere closest to the nucleus are in the __________ energy level.

Accepted Answer

lowest

Question 3

What 19th century scientist combined the idea of elements with the Greek theory of the atom?

Accepted Answer

John Dalton

Question 4

A chlorine atom (neutral ion) has 17 protons and 18 neutrons. How many electrons does it have?

Accepted Answer

17

Question 5

How are elements arranged in a row on the periodic table of elements?

Accepted Answer

in order of increasing atomic number

Question 6

Carbon-14 is useful in determining __________.

Accepted Answer

the age of dead plants and animals

Question 7

Most of an atom's mass is contained in _______

Accepted Answer

the nucleus

Question 8

In the periodic table, elements in the same column have similar _______.

Accepted Answer

chemical properties

Question 9

What is true about an atom that is electrically neutral?

Accepted Answer

The number of protons equals the number of electrons.

Question 10

Which of the following best describes Thomson's model of the atom?

Accepted Answer

ball of raisin-cookie dough - raisins representing electrons

Question 11

Rutherford called the positively charged, central part of the atom the __________ .

Accepted Answer

nucleus

Question 12

All ions of the same element have the ________.

Accepted Answer

number of protons

Question 13

About how big is an atom?

Accepted Answer

One ten-millionth of a millimeter

Question 14

Ernest Rutherford experimented with alpha particles and thin gold foil to find out __________ .

Accepted Answer

if Thomson's model of the atom was correct

Question 15

What particle in an atom is electrically neutral?

Accepted Answer

neutron

Question 16

The atomic number of calcium is 20. How many protons does a calcium atom contain?

Accepted Answer

20

Question 17

A(n) ________ is a method of representing atoms and the electrons in their outer energy levels.

Accepted Answer

electron dot diagram

Question 18

The small, negatively charged particles discovered by J.J. Thomson are called __________ .

Accepted Answer

electrons

Question 19

All atoms of the same element have the same _______.

Accepted Answer

atomic number

Question 20

In most periodic tables, the block for each element usually includes the element's________.

Accepted Answer

name, symbol, atomic number

Question 21

Matter takes up . . . .

Accepted Answer

space and mass

Question 22

All isotopes of an element ________.

Accepted Answer

have the same chemical properties

Question 23

What is the atomic mass of an atom?

Accepted Answer

the number of protons and neutrons in the nucleus

Question 24

A(n) __________ is a pure substance that contains at least two elements.

Accepted Answer

compound

All About The Atom

Questions 24

All About The Atom

Questions 24