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Elements and Compounds

Across
A combination of two or more substances which do not chemically combine.
The sum of all living matter, made of limited number of elements including oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
A measure of the space that matter occupies.
All the water on the earth
Made of the same evenly distributed substance or combination of substances throughout.
They layer of gas surrounding planet Earth, held in place by gravity and composed of limited number of elements, primarily nitrogen and oxygen.
A substance of two or more elements that are chemically combined in fixed amounts.
A measure of how much matter is present in a substance.
Down
A pure substance composed of the same type of atom throughout.
Any form of matter that is uniform throughout and has consistent properties
The rigid, outer part of the earth.
A table in which all the known elements are arranged by properties and are represented by one or two letters, referred to as chemical symbols.
Anything that has mass and takes up space.
The smallest particle of an element, made of electrons, protons and neutrons.
Physical and chemical characteristics of matter used to describe or identify a substance.