Atomic Structure, Isotopes, and Mass Spec

Question 1

Which part or parts of Dalton's atomic theory are no longer accepted as true?

Accepted Answer

Answers 2 & 3

Question 2

What did JJ Thomson discover with his cathode ray experiment?

Accepted Answer

electron

Question 3

Which is a molecule?

Accepted Answer

All of the above

Question 4

What is an ion?

Accepted Answer

An atom that is electrically charged.

Question 5

what is a polyatomic ion?

Accepted Answer

ion composed of two or more atoms covalently bonded

Question 6

What does the number after Carbon-12 represent?

Accepted Answer

the mass

Question 7

Which particle determines the identity of the element?

Accepted Answer

protons

Question 8

How many electrons does the following krypton atom contain?

Accepted Answer

36

Question 9

All molecules are compounds.

Accepted Answer

False

Question 10

1. What is the electric charge of a proton?

Accepted Answer

positive

Question 11

Which of the following is NOT a pure substance?

Accepted Answer

air

Question 12

Calculate the average atomic mass of Li from its mass spec graph.

Accepted Answer

6.93 amu

Question 13

identify the picture

Accepted Answer

Compound

Question 14

What region of the atom is mostly empty space?

Accepted Answer

electron cloud

Question 15

Which subatomic particle changes when the atom forms an ion?

Accepted Answer

electron

Question 16

An isotope of an element has the same protons but different..

Accepted Answer

neutrons

Question 17

How many neutrons does the following krypton atom contain?

Accepted Answer

42

Question 18

How would you describe the overall charge of an atom?

Accepted Answer

neutral

Question 19

What element is represented by the mass spec graph?

Accepted Answer

Ga

Question 20

Because most particles fired at gold foil passed straight through it, and few were deflected:

Accepted Answer

the mass of an atom is mostly in a small nucleus

Question 21

Boron-11 is 80% abundant and Boron-10 is 20%. Estimate the average atomic mass of Boron.

Accepted Answer

10.80 amu

Question 22

Rutherford's experiment determined that the nucleus was ___ and most of the atom is ____.

Accepted Answer

positive, small, and dense; empty space

Question 23

What is the mass of an electron?

Accepted Answer

It is so small we ignore its mass

Question 24

How would you describe the overall charge of the nucleus?

Accepted Answer

positive

Atomic Structure, Isotopes, and Mass Spec

Questions 24

Atomic Structure, Isotopes, and Mass Spec

Questions 24