Ch. 4 Atomic Structure

1.

1 point

The number 12 in carbon's unit cell is:

number of electrons

number of protons

atomic weight

atomic number

2.

1 point

JJ Thompson did which of the following?

discovered the electron with a cathode ray tube

found the nucleus to be positive with the gold foil exp.

found the neutron with gamma rays

found the charge of an electron with the oil drop

3.

1 point

Isotopes of an element have varying:

protons

neutrons

electrons

4.

1 point

Electrons and protons have the same charge.

True

False

5.

1 point

SEM can be used to see atoms and compounds both large and small.

True

False

6.

1 point

Lithium (atomic number 3) with a +1 charge has how many electrons?

1

3

4

2

7.

1 point

Fluorine (atomic number 9) with a negative 1 charge has how many electrons?

2

6

4

10

8.

1 point

Millikan did which of the following?

found the charge of an electron with oil drop exp.

found the core to be positive with gold foil exp.

found the electron with the cathode ray tube

found the neutron with gamma rays

9.

1 point

The core of an atom is composed of:

electrons and protons

protons and neutrons

neutrons and electrons

protons, neutrons and electrons

10.

1 point

Adding electrons to an atom will change the atomic mass by 1 amu.

True

False

11.

1 point

Atoms can sense each other due to __________ and __________ fields.

12.

1 point

Which of the main subatomic particles is smallest?

protons

atoms

electrons

neutrons

13.

1 point

Having more electrons than protons leads to a:

positive charge

negative charge

14.

1 point

Atoms cannot be broken down into more basic components

True

False

15.

1 point

All carbon atoms have how many protons?

4

6

8

2

16.

1 point

Rutherford did which of the following?

found the core of the atom to be positive with the gold foil exp.

found neutrons with gamma rays

found the electron with the cathode ray tube

found charge of an electron with oil drop exp.

17.

1 point

The principle quantum number (#'s ranging from 1-7) is also called the

orbital

energy level shell

quantum spin

subshell

18.

1 point

Atoms can gain and lose protons without changing the element.

True

False

19.

1 point

Adding electrons to an atom makes the atom more negative.

True

False

20.

1 point

Two neutral carbon atoms have masses of 12 and 13. The ONLY difference between the two is the number of:

neutrons

atoms

electrons

protons

21.

1 point

Atoms can gain and lose electrons.

True

False

22.

1 point

What are the 3 major subatomic particles?

protons

neutrons

electrons

All of the above

23.

1 point

Which subatomic particle is responsible for bonding?

electrons

quarks

protons

neutrons

24.

1 point

What is the most likely atomic weight of an element with the following abundances: 95% (30 amu) and 5% (28 amu)?

28

30

31

28.2

25.

1 point

The bulk of an atom's mass is mainly due to:

protons and electrons

protons and neutrons

all of the space it takes up

electrons

26.

1 point

A neutral atom with 10 protons and mass of 21 amu has ______ electrons and _____ neutrons.

11;10

9;10

10;11

10;9

27.

1 point

The majority of the atom is mainly:

electrons

protons

neutrons

space