Isotopes

How many neutrons in C-14?

• 6
• 7
• 14
• 8

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

How many neutrons does uranium-235 have?

• 238
• 92
• 146
• 143

Tags

NGSS.HS-PS1-8

What do these isotopes of carbon all have in common?

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

What quantities vary between isotopes of an element?

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

Tags

NGSS.HS-PS1-8

which atom has  4 neutrons?

• Li-6
• Li-7
• Li-8
• they have the same # of neutrons

Tags

NGSS.MS-PS1-1

Atoms of the same element must always have the same number of _________

• electrons
• neutrons
• isotopes
• protons

Tags

NGSS.HS-PS1-7

 Copper occurs naturally as Cu-63 and Cu-65. Which isotope is more abundant?

• Cu-63
• Cu-65

Magnesium consists of three naturally occurring isotopes. The percent abundance of  these isotopes is as follows: ²⁴Mg (78.70%), ²⁵Mg (10.13%), and ²⁶Mg (11.7%). The average atomic mass of the three isotopes is 24.3050 amu. If the atomic mass of ²⁵Mg is 24.98584 amu, and ²⁶Mg is 25.98259 amu, calculate the actual atomic mass of ²⁴Mg.  

• 23.985 amu
• 21.421 amu
• 24.463 amu
• 24.002 amu