Atomic Theory & Moles

What do these isotopes of carbon all have in common?

• neutrons & mass number

• atomic number and neutrons

• atomic number, protons and electrons

• protons, atomic number, and mass number

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

Tags

NGSS.HS-PS1-8

In a correctly written symbol what would be located in the "A" position?

• number of neutrons
• atomic number
• number of electrons 
• mass number

Tags

NGSS.HS-PS1-8

What quantities vary between isotopes of an element?

• protons, electrons, and atomic mass
• protons, electrons, and atomic number
• neutrons and electrons
• neutrons and atomic mass

Tags

NGSS.HS-PS1-8

How many neutrons does an atom of the isotope Neon-22 have?

• 12
• 10
• 22
• 20

Tags

NGSS.HS-PS1-8

Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208.  The average atomic mass of lead is 207.2.  Which isotope of lead is likely to be the most abundant.

• 204
• 206
• 207
• 208

Tags

NGSS.MS-PS1-1

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?

• 34
• 36
• 2
• 40

Tags

NGSS.HS-PS1-1

The positive particles in an atom are

• electrons

• positrons

• neutrons

• protons

The central region of an atom where its neutrons and protons are is its

• nucleus

• electron cloud

• core

• center

An atom with atomic number 6 would have how many protons

• 6

• 12

• 3

• cannot be determined