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Crossword clues

Solve these clues to fill the grid.

State of matter that fills any space, like air
2 Across
Center of an atom or a cell
4 Across
An elementary particle with negative charge
9 Across
One of two or more atoms with the same atomic number but with different numbers of neutrons
11 Across
The order of an element in Mendeleyev's table of the elements
14 Across
The smallest component of an element having the chemical properties of the element
15 Across
A chemical ___ in which one atom loses an electron to form a positive ion and the other atom gains
16 Across
How much matter something contains
1 Down
How tightly packed the matter in something is
3 Down
An abstract part of something
5 Down
A chemical ___ that involves sharing a pair of electrons between atoms in a molecule
6 Down
A substance consisting of two or more substances mixed together
7 Down
A fourth state of matter distinct from solid or liquid or gas and present in stars and fusion
8 Down
How loud something is, or how much space it fills
10 Down
A substance formed by chemical union of two or more elements or ingredients in definite proportion
12 Down
State of matter that flows like water
13 Down

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