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18 Cards in this Set
- Front
- Back
- 3rd side (hint)
Atom |
The smallest particle of an element |
atoms are made of protons, neutrons and electrons, like a hydrogen atom |
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Atomic mass |
The mass of an atom in atomic mass units; the average mass of the atoms of an element |
The atomic mass of Lithium is 6.941 |
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Atomic mass unit |
One-twelfth the mass of the 12/6C atom |
Atomic mass unit is the standard unit used to indicate mass on a molecular level |
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Atomic number |
The number of protons in the nucleus of an atom |
The atomic number of helium is 2 |
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Atomic symbol |
Symbol that represents the element |
the atomic symbol for hydrogen is H |
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Chemical symbol |
A notation using one to three letters to represent an element |
the chemical symbol for oxygen is O2 |
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Electron |
an elementary particle with unit negative charge |
An electron is negative |
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group |
The elements of a vertical column in the periodic table |
Lithium and sodium are in the same group on the periodic table |
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Isotope |
one of two or more atoms having the same number of protons but different numbers of neutrons |
Hydrogen has three isotopes |
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Mass number |
the total number of protons and neutrons in an atom |
the mass number of flourine is 19 |
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Metal |
an element that tends to lose electrons in chemical reactions |
zinc is a metal |
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Metalloid |
an element that has properties characteristic of a metal and a nonmetal |
boron is a metalloid |
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Neutron |
a neutral subatomic particle |
there is the same amount of neutrons as protons |
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Nonmetal |
an element that tends to gain electrons in chemical reactions |
helium is a nonmetal, it's a gas |
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Nucleus |
the core of an atom |
the nucleus holds the protons and neutrons |
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Period |
a horizontal row of the periodic table |
lithium and berylium are in the same period |
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Proton |
positive nucleon |
Protons are positive, within the nucleus |
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Subatomic particle |
a particle smaller than an atom |
protons and neutrons are subatomic particles |
