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Atoms and isotopes

Study Slideshow

In uranium - 235 what does 235 represent?

mass number

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How do you calculate mass number?

protons + neutrons

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A charge of +2 means you have

more protons than neutrons

more electrons than neutrons

more electrons than protons

more protons than electrons

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How many protons does Calcium have?

20

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If Aluminum has a charge of +3, how many electrons are present?

10

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If Arsenic has a charge of -3, then how many electrons does it have?

36

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If Beryllium is electrically neutral, how many electrons does it have?

4

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What subatomic particle can NEVER change?

protons

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For an atom to have an overall negative charge

electrons were lost

electrons were gained

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Isotopes differ in the number of

neutrons

electrons

protons

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The atomic number represents the number of...

neutrons

protons

ions

electrons

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If you want to determine the total number of protons and neutrons in an atom, you can refer to the...

mass number

atomic weight

ion number

atomic number

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The atomic mass of an element is the weighted average of the masses of all its ______ that occur naturally

protons

electrons

neutrons

isotopes

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What do these isotopes of carbon all have in common?

protons, atomic number, and mass number

atomic number and neutrons

atomic number and electrons

neutrons and mass number

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How many neutrons does the isotope of lithium-8 have?

5

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How many neutrons in C-14?

8

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