Unit 2 Atoms & Periodic Table STUDY GUIDE

Which of the atoms is sodium (Na)?

• I, only

• II, only

• I and III

• II and III

Tags

NGSS.MS-PS1-1

What does 1 represent?

• chemical symbol

• oxidation number

• atomic number

• atomic mass

Which subatomic particles are primarily responsible for giving an atom its mass?

• A. electrons and neutrons

• B. protons and neutrons

• C. electrons, only

• D. protons, only

An atom is an isotope of an element if it has

• the same number of neutrons and a different number of protons.

• the same number of neutrons and a different number of electrons.

• the same number of electrons and a different number of protons.

• the same number of protons and a different number of neutrons.

An element's periodic table identity is defined by its number of

• protons.

• neutrons.

• isotopes.

• electrons.

The atomic mass of titanium (Ti) is 47.88 atomic mass units. This atomic mass represents the

• total mass of all the protons and neutrons in an atom of Ti.

• total mass of all the protons, neutrons, and electrons in an atom of Ti.

• weighted average mass of the most abundant isotope of Ti.

• weighted average mass of all the naturally occurring isotopes of Ti.

An aluminum isotope consists of 13 protons, 13 electrons and 14 neutrons. What is its mass number?

• A. 13

• B. 14

• C. 27

• D. 40

What is the charge of an ion that has 8 protons, 9 neutrons, and 10 electrons?

• 1+

• 2+

• 1-

• 2-

What happens when a sodium atom becomes a sodium ion?

• A. A valence electron is gained.

• B. A valence electron is lost.

• C. A proton is gained.

• D. A proton is lost.

Tags

NGSS.MS-PS1-2

An unknown substance is a very good conductor of heat and electricity and can be bent and shaped easily. This unknown substance could be which element?

• mercury

• copper

• hydrogen

• boron

Tags

NGSS.MS-PS3-3