Isotopes and Electrons Practice

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

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

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

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

which atom has  4 neutrons?

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

^{The photo above shows the isotopic notation for which isotope?}

• Carbon 12
• Carbon 13
• Carbon 14
• Carbon 15

In the following pair, are they isotopes or different elements.

Element x has 6 protons and 7 neutrons.

Element y has 7 protons and 7 neutrons.

• isotopes of same element

• different elements

In the following pair, are they isotopes or different elements.

Element x has 27 protons and 82 neutrons.

Element y has 27 protons and 83 neutrons.

• isotopes of same element

• different elements

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu
• 24.97 amu
• 75.01 amu
• 74.51 amu