Free Printable Atoms

1.

The positive particles of an atom are ___________.

a)

electrons

b)

protons

c)

neutrons

2.

The center of an atom where its neutrons and protons are is called the _____________.

a)

nucleus

b)

electron cloud

c)

center

3.

An atom is made up of protons, neutrons, and electrons. Which is the smallest subatomic particle?

a)

Proton

b)

Neutron

c)

Electron

d)

Idontknowatron

4.

Which is an electron?

a)

A

b)

B

c)

C

5.

How many electrons does Si contain?

a)

14

b)

28

c)

2

d)

4

6.

What is the mass number and name of an element with 8 protons and 8 neutrons?

a)

16 - Carbon

b)

16 - Oxygen

c)

24 - Oxygen

d)

8 - Neon

7.

Which part of an atom has a negative charge?

a)

Proton

b)

Neutron

c)

Electron

d)

None of them

8.

Which part of an atom has no charge?

a)

Proton

b)

Neutron

c)

Electron

d)

None of them

9.

Using the picture from a periodic table, what is the Atomic Number?

a)

26

b)

Fe

c)

55.845

d)

56

10.

Using the picture from a periodic table, what is the Atomic Mass?

a)

26

b)

Fe

c)

55.845

d)

56

11.

When two atoms of the same element have different masses, they are called ______, and have a different number of ______.

a)

Neutrons; Isotopes

b)

Atoms; Isotopes

c)

Isotopes; Protons

d)

Isotopes; Neutrons

12.

Calcium has the atomic number 20. If it has a mass number of 46, how many neutrons are present?

a)

46

b)

20

c)

26

d)

We cannot tell

13.

Which of the following are isotopes?

a) ¹⁴₇X b) ¹⁴₆X c) ¹⁵₇X d) ¹⁵₈X

a)

a and b

b)

a and c

c)

c and d

d)

a and d

14.

Identify the isotope that has 12 protons and 13 neutrons

a)

Mg-12

b)

Mg-13

c)

Mg-25

d)

Mg-24.305

15.

......is the basic unit of an element that has the same chemical properties of that element

a)

Molecules

b)

Atoms

c)

Electrons

d)

Neutrons, electrons, protons

16.

The term "neutral" means

a)

having only a little bit of charge

b)

having a positive charge

c)

having a negative charge

d)

having no charge at all

17.

Which of the following determines the identity of an element?

a)

the number of protons

b)

the number of neutrons

c)

the arrangement of electrons

d)

the number of energy levels

18.

Protons and Neutrons are more massive than electrons. Therefore, most of the _____ of the atom is in the ______.

a)

energy ..... proton

b)

nucleus .... electron

c)

properties ... orbital

d)

mass .... nucleus

19.

How many different elements are present in H₂COCH₂

a)

5

b)

4

c)

3

d)

2

20.

How many oxygen atoms are in Al(OH)₃

a)

1

b)

2

c)

3

d)

4

21.

The ______ are numbers found on the lower right-hand side of an element symbol.

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

22.

Identify the number of each element in H₂SO₄

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

23.

What is the mass number of bromine?

a)

35

b)

45

c)

80

d)

79.904

24.

How many neutrons does this bromine atom have?

a)

35

b)

45

c)

80

25.

What two particles determine the mass number?

a)

Protons and electrons

b)

Electrons and neutrons

c)

Protons and neutrons

26.

Avogadro's number is

a)

$6.02\ x\ 10^{23}$

b)

$6.02\ x\ 10^2$

c)

$6.02$

d)

$6.02\ x\ 10^{25}$

27.

How many atoms are in one mole?

a)

$6.02\ x\ 10^{23}$

b)

$6.02\ x\ 10^{20}$

c)

$6.02\ x\ 23$

d)

$6.02\ x\ 1^{23}$

28.

What units are used for molar mass?

a)

$\frac{grams}{mole}$

b)

$\frac{moles}{atom}$

c)

$AMU$

d)

degrees Fahrenheit

29.

What is the molar mass of calcium?

a)

40.078

b)

20

c)

2

d)

6.022 x 10^23

30.

How many silicon atoms are in 3 moles of silicon?

To solve this problem you should...

a)

multiply by $\frac{1\ mole}{6.022x10^{23}}$

b)

multiply by $\ \frac{1\ mole}{28.085\ g}$

c)

multiply by $\frac{6.022x10^{23}}{1\ mole}$

d)

multiply by $\frac{28.085\ g}{1\ mole}$

31.

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

a)

Electron Shells

b)

Orbitals

c)

Electron Cloud

d)

Nucleus

32.

Used the word "atomos" to decsribe the uncuttable (indivisible) atom.

a)

Democritus

b)

Thomson

c)

Bohr

d)

Dalton

33.

Proposed that electrons move around the nucleus in specific layers, or shells.

a)

Bohr

b)

Rutherford

c)

Chadwick

d)

Thomson

34.

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

a)

Atoms

b)

Parts

c)

Molecules

d)

Hydrogen

35.

Which of the following is/are conclusions based on Rutherford’s gold foil experiment?

a)

Atom is mostly empty space

b)

The nucleus is positively charged

c)

The atom has a small dense nucleus

d)

All answers are correct

36.

What was JJ Thomson responsible for finding?

a)

protons

b)

neutrons

c)

nucleus

d)

electrons

37.

Thompson's model of negative electrons randomly distributed through a positively charged matrix is called the -

a)

plum pudding model

b)

atomos

c)

bohr model

d)

gold foil model

38.

The Law of Conservation of Mass States

a)

Energy cannot be created nor destroyed, it can only change form.

b)

Mass cannot be created nor destroyed, it can only change form.

c)

Mass can be created or destroyed, it cannot change form.

39.

A student dissolved 25 grams of salt into 1,000 grams of water. What should the mass of the saltwater mixture be?

a)

975 grams

b)

1,000 grams

c)

1,025 grams

d)

2,500 grams

40.

“If two elements A and B combine to form more than one compound, the masses of B that can combine with a given mass of A are the ratio of small whole numbers” Which of the given laws below explains the given statement above?

a)

Law of Definite Proportion

b)

Law of Conservation of Mass

c)

Law of Multiple Proportions

41.

“All compounds, regardless of source or how they are prepared

have the same proportions of their basic elements” Which of the follow laws explains the given statement?

a)

Law of Conservation of Mass

b)

Law of Definite Proportion

c)

Law of Multiple Proportions

42.

Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?

a)

A

b)

B

c)

C

d)

D

43.

If you have 82.21 grams of NO₂, how many molecules do you have?

Pick the correct setup.

a)

$82.21\ g\ \times\frac{1\ mol}{46.01\ g}\times\frac{1\ mol}{6.02x10^{23}\ molecules}$

b)

$82.21\ g\ \times\frac{1\ mol}{46.01\ g}\times\frac{6.02x10^{23}\ molecules}{1\ mol}$

c)

$82.21\ g\ \times\frac{6.02x10^{23}\ molecules}{1\ mol}$

d)

$82.21\ g\ \times\frac{1\ mol}{46.01\ g}$

Atoms

Total questions: 43

Worksheet time: 29mins

Similar Resources on Wayground