7th 1.3 Vocab

Last updated almost 3 years ago

7 Nsɛmmisa

7th 1.3 Vocab

Last updated almost 3 years ago

7 Nsɛmmisa

atom: the of an element that has all the chemical properties of that element

is made of atoms. Atoms are very small and cannot be seen using conventional microscopes. A grain of salt contains about (1,200,000,000,000,000,000) atoms. Atoms consist of a containing protons and often neutrons surrounded by .

Latin root atomus meaning ""

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chemical formula: a set of used to describe the within a substance

Table salt is composed of two elements in a 1:1 ratio: (Na) and (Cl). The chemical formula for salt is NaCl.

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Chemical structure of

chemical symbol: the one- or two-letter representation of an ; symbols are often derived from the Latin name of the element

Latin stem symbolum meaning “creed, token, ”; Greek stem symbolon meaning “token, watchword”

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From the Greek words (water) and (forming).

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Simple images of the IUPAC designation for elements

compound: a that is formed when two or more different combine; can usually be separated by reaction

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In solid form, compounds likecommon salt (NaCl) form arrangements of ions called . Figure (a) is a ball-and-stick model of NaCl, and figure (b) is a more realistic space-filling model, with cations in contact with anions.

element: a that cannot be broken down into simpler substances by chemical reactions

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is an element.

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The element is precious for its lustre.

molecule: two or more joined together

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A molecule of contains three atoms of oxygen. A molecule of contains two atoms of hydrogen and one atom of oxygen. Similarly, a molecule of contains one atom of nitrogen and three atoms of hydrogen.

polymer: a that is made of that are arranged in a repeating structure

From the Greek polymeres “.”

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is a polymer containing thousands of .