Chapter 4 Atoms Test

1.

1 point

The electrons in the outer energy level of an atom are called ___________ _______________.

2.

1 point

A __________ is a unit or quantum of light.

3.

1 point

To find the mass of an element in grams, you must

multiply the amount of an element in moles by the molar mass of that element.

divide the amount of an element in moles by the molar mass of that element.

not do any mathematical methods since the mass of an element is just the atomic mass of that element.

create a reasonable estimate of what the mass of the element is.

4.

1 point

Choose two choices below that fit in the following statement:

The two metal plates at the ends of the vacuum tube are called the _______ and the _______.

anode

hot plate

cathode

electron

5.

1 point

The 4th energy level can hold how many electrons?

36

18

40

32

6.

1 point

According to the ______________________, a chemical compound always contains the same elements in exactly the same proportions by weight or mass.

Law Of Chemical Compound Conservation

Law Of Definite Proportions

Regulations Of Matter

Atomic Theory

7.

1 point

What was the difference between Dalton's atomic theory and Democritus's atomic theory?

There were no differences since both were exactly the same.

Both theories were not applied to all observations.

Democritus's theory was more accurate than Dalton's.

Dalton based his theory on experimental evidence.

8.

1 point

Which of the following isn't a difference between Bohr's model of the atom and the modern atomic model?

In the modern atomic model, electrons are found in orbitals.

Bohr's model assumed that electrons orbited the nucleus along definite paths.

Bohr's model was bigger than the modern atomic model.

9.

1 point

Rutherford proposed that

cathode rays were made of negatively charged particles that came from inside atoms.

the universe was made of indivisible units.

most of the mass of the atom was concentrated at the atom's center.

all atoms of a given element were exactly alike, and atoms of different elements could join to form compounds.

10.

1 point

Who's cathode ray tube experiment suggested that cathode rays were made of negatively charged particles that came from inside atoms?

Democritus

Ernest Rutherford

John Dalton

J.J. Thomson

11.

1 point

According to Dalton's version of the atomic theory, all atoms of a given element were exactly alike, and atoms of different elements could join to form compounds.

True

False

12.

1 point

Unstable isotopes, called _______________, emit radiation and decay into other isotopes.

reactive isotopes

radioisotopes

radioactivity

unstable isotopes

13.

1 point

An ______________ is an atom that has the same number of protons but a different number of neutrons relative to other atoms of the same element.

14.

1 point

What is Avogadro's number used for?

nothing

counting atoms

counting large objects

none of the above

15.

1 point

How much effect does commonly found isotopes have on the average atomic mass of an element?

more than rarely found isotopes

no effect

about the same as rarely found isotopes

less than rarely found isotopes

16.

1 point

There are four types of orbitals. What are they?

s, p, d, f

s, x, t, o

s, d, x, f

d, e, m, i

17.

1 point

What is a p orbital shaped like?

a dumbbell

a cloud

a sphere

a pyramid

18.

1 point

Sodium has 11 electrons. How many valence electrons does Sodium have?

3

0

1

2

19.

1 point

Positive and negative charges attract each other with a force known as the ___________.

unified mass force

ionization

unknown force

electric force

20.

1 point

If an atom loses an electron, what charge does the atom have?

Negative

Positive