Periodic table flashcards

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1
Q

an arrangement of elements in columns, based on a set of properties that repeat from row to row.

A

Periodic table

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2
Q

A chemist who developed the periodic table and organized elements by their properties while leaving empty spaces for more elements to be discovered

A

Mendeleev

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3
Q

A pure substance that cannot be broken down.

A

Element

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4
Q

A row going across on the periodic table

A

Period

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5
Q

A column going up and down on the Periodic Table

A

Group / Family

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6
Q

The pattern of repeating properties down each group in the periodic table

A

Periodic law

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7
Q

A one or two letter symbol that represents that name of an element
(first letter is capital and potential second letter is lowercase)

A

Chemical / Element Symbol

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8
Q

number of protons in an element,
atomic # is also equal to the number of electrons

A

Atomic Number

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9
Q

The number of protons and neutrons in the nucleus (center) of an element

A

Atomic Mass

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10
Q

A material that allows things to flow

A

Conductor

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11
Q

elements that are good conductors of heat and electric current

A

Metal

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12
Q

elements that are poor conductors of heat and electric current

A

Nonmetal

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13
Q

elements with properties that fall between those of metals and nonmetals

A

Metalloid

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14
Q

Elements in group 18, stable and nonreactive

A

Noble Gas

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15
Q

A particle with a positive charge, same amount as atomic number, this particle identifies the element

A

Proton

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16
Q

A particle with a neutral charge, same amount as (atomic mass - atomic number)

A

Neutron

17
Q

A particle with a negative charge, same amount as atomic number

A

Electron

18
Q

Electrons on the outermost shell

A

Valence Electron

19
Q

Outer boundary of an atom, mostly empty space, each shell starting from the first shell can hold:
1st shell - 2 electrons
2nd shell - 8 electrons
3rd shell - 18 electrons
4th shell - 32 electrons

A

Orbital / Shell / Energy Level

20
Q

the center of an atom that contains neutrons and protons and therefore most of the mass

A

Nucleus (in an atom)

21
Q

a force of attraction between atoms to make them more stable

A

Chemical Bond

22
Q

when atoms transfer electrons and become charged particles

A

Ion

23
Q

the force of attraction that holds together positive and negative ions, a transfer of electrons

A

Ionic Bond

24
Q

A force of attraction that holds together two atoms and shares electrons

A

Covalent Bond

25
Q

shows the elements involved in that molecule and the number of atoms of each element

A

Chemical formula

26
Q

Shows the molecules involved in a reaction
reactants show the ingredients and the products show the results

A

Chemical equation