Chemistry

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Definitions of elements ?
An element is a substance consisting of atoms which all have the same number of protons - i.e. the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical methods.
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Definitions of compounds?
Definition of Compound. A compound is a substance formed when two or more chemical elements are chemically bonded together. Two types of chemical bonds common in compounds are covalent bonds and ionic bonds.
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Define atomic number
Atomic number - the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
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Define ionic bonding
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmet
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Define mass number
the total number of protons and neutrons in a nucleus.
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Define covalent bonding
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share el
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Why elements in the same group have similar properties
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali metals. Grou
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How sodium ions are formed from sodium atoms
The sodium has lost an electron, so it no longer has equal numbers of electrons and protons. Because it has one more proton than electron, it has a charge of 1+. If electrons are lost from an atom, positive ions are formed. The chlorine has gained an
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How chloride ions are formed by chlorine atoms
When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called an ionic compound. Consider reactions between metals and non-metals, for example: Sodium + chlori
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Card 2

Front

Definitions of compounds?

Back

Definition of Compound. A compound is a substance formed when two or more chemical elements are chemically bonded together. Two types of chemical bonds common in compounds are covalent bonds and ionic bonds.

Card 3

Front

Define atomic number

Back

Preview of the front of card 3

Card 4

Front

Define ionic bonding

Back

Preview of the front of card 4

Card 5

Front

Define mass number

Back

Preview of the front of card 5
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