Atom Review

Which of the following is true regarding electrons?

• They are larger than protons and have a charge of -1

• They are smaller than protons and have a charge of -1

• They are larger than protons and have a charge of +1

• They are smaller than protons and have a charge of +1

Tags

NGSS.MS-PS2-3

The radioactive decay of a particular substance is shown in the graph to the left. What is the half life of this isotope?

• 5 days

• 10 days

• 15 days`

• 20 days

Element X has 3 stable isotopes. X-95 (22% abundant), X-96 (75% abundant), and X-98 (3% abundant). When calculating the average atomic mass, which number would you expect the atomic mass to be closest to?

• 95

• 96

• 97

• 98

How many protons, neutrons, and electrons are in a neutral atom of Chlorine-37?

• 18, 37, 18

• 17,35,18

• 17, 20, 17

• 17,18,18

Tags

NGSS.MS-PS1-1

A particular atom contains 10 protons, 10 electrons, and 13 neutrons. What is the mass number? What is the element?

• 23; sodium

• 20; sodium

• 10; boron

• 12; magnesium

Tags

NGSS.MS-PS1-1

Uranium-235 is a radioactive isotope with a half life of 704 million years. How much of a 500.0 gram sample will remain after 2,816 million years?

• 0.7102 grams

• 4.000 grams

• 125.0 grams

• 31.25 grams

Tags

NGSS.HS-PS1-8

Which of the following would be isotopes of each other?

• A and D

• B and C

• C and D

• A and B

Tags

NGSS.MS-PS1-1

The element shown would have:

• 78 protons, 34 neutrons, and 78 electrons

• 78 protons, 78 neutrons, and 34 electrons

• 34 protons, 34 neutrons, and 44 electrons

• 34 protons, 44 neutrons, and 34 electrons

Tags

NGSS.MS-PS1-1

What does the 78 represent?

• number of protons

• mass number

• atomic number

• number of neutrons

Which of the models of the atom is the current model?

• plum pudding

• planetary

• solid sphere

• quantum mechanical