Atoms and Isotopes Unit Test

The atomic number of an isotope represent the number of

• protons

• protons + neutrons

• neutrons

• neutrons + electrons

The number of protons + neutrons in an atomic nucleus is referred to as what?

• Atomic number

• Isotope number

• Mass number

Tags

NGSS.MS-PS1-1

How many protons are found in this isotope? ⁷⁵₃₃As

• 75

• 42

• 33

• 108

Tags

NGSS.HS-PS1-1

What charge does an atom have when it GAINS electrons?

• Positive

• Negative

• Neutral

What is the mass number of this Neon atom?

• 10

• 11

• 21

• 20

Tags

NGSS.MS-PS1-1

What does the 1.00794 stand for?

• number of neutrons

• atomic number

• atomic mass

• number of protons

Tags

NGSS.MS-PS1-1

A neutral atom of the isotope ²⁶₁₂Mg would consist of

• 12 protons, 26 neutrons, 26 electrons
• 26 protons, 12 neutrons, 26 electrons
• 26 protons, 14 neutrons, 14 electrons
• 12 protons, 14 neutrons, 12 electrons

Tags

NGSS.MS-PS1-1

A carbon isotope consists of 6 protons, 6 electrons and 8 neutrons.  What is the mass number for this isotope?

• 12
• 14
• 6
• 8

Tags

NGSS.MS-PS1-1

Can an atom of Hydrogen have 2 protons?

• Yes, because it can be an ion
• No, because protons identify the atom
• Yes, because it can be an isotope
• No, because only neutral atoms exist

Tags

NGSS.MS-PS1-1

Which answer choice describes the subatomic particles and their respective charges?

• p-    e+    n
• p+    e     n-
• p+    e-    n
• p-     e+    n