Chapter 4 Atomic Structure

Question 1

What unit is used to measure weighted average atomic mass?

Accepted Answer

amu

Question 2

Which subatomic particle is positive?

Accepted Answer

proton

Question 3

Which of the following is correct?

Accepted Answer

The neutron was discovered by Chadwhick

Question 4

What does the atomic mass of an element depend on?

Accepted Answer

mass and relative abundance of each isotope

Question 5

The atomic number of an element is the total number of which particles in the nucleus?

Accepted Answer

protons

Question 6

Which of the following statements is NOT true?

Accepted Answer

Electrons are negative and have a mass of 1 amu

Question 7

Which subatomic particle is neutral?

Accepted Answer

neutron

Question 8

What is 1/12 the mass of the Carbon-12 atom?

Accepted Answer

atomic mass unit

Question 9

Using the periodic table, determine the number of neutrons in Cobalt-59.

Accepted Answer

32

Question 10

Who was the man who lived 460-370 B.C. and was the first to suggest the idea of atoms?

Accepted Answer

Democritus

Question 11

Which subatomic particle is negative?

Accepted Answer

electron

Question 12

What is the central part of the atom, containing the protons and neutrons?

Accepted Answer

nucleus

Question 13

What is the smallest particle that retains the properties of an element?

Accepted Answer

atom

Question 14

What is the relative mass of an electron?

Accepted Answer

1/1840 the mass of a proton

Question 15

Which of the following equals one atomic mass unit?

Accepted Answer

1/12 the mass of a Carbon-12 atom

Question 16

Which of the following is NOT part of Dalton's theory?

Accepted Answer

Atoms are always moving

Question 17

What is the total number of protons and neutrons in the nucleus?

Accepted Answer

mass number

Question 18

What is the atomic mass of an element?

Accepted Answer

weighted average of the masses of isotopes of the element

Question 19

Atoms with the same number of protons, but different neutrons are called ____?

Accepted Answer

isotopes

Question 20

How do you calculate the number of neutrons in the nucleus of an atom?

Accepted Answer

Subtract protons from mass number

Questions 20