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Atomic structure and the periodic table
Atoms, elements and compounds
Chemical formulae of ions
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Cards (15)
What do chemists use to represent elements and compounds?
Symbols
and
formulae
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What do word equations and balanced chemical equations represent?
The changes that happen in
chemical reactions
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What is an ion?
An
electrically
charged particle formed when an atom or molecule gains or loses
electrons
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How is an ion formed?
When an atom or a group of atoms loses or gains
electrons
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What is the charge of an electron?
Negative
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What does the superscript in a chemical formula indicate?
The number and sign of its
electrical charges
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What are the names and formulas of some common ions?
Sodium
:
Na
<sup>+</sup>, One positive
Magnesium
:
Mg
<sup>2+</sup>, Two positive
Chloride
:
Cl
<sup>-</sup>, One negative
Oxide
: O<sup>2-</sup>, Two negative
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What is an ionic compound?
An ionic compound occurs when a
negative ion
joins with a
positive ion
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How can the formula of an ionic compound be predicted?
Using the
formulae
of its
ions
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What must the numbers of ions in a formula provide?
An equal number of positive and negative
charges
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What are the formulas and electrical charges of some common ionic compounds?
Sodium chloride
:
NaCl
, One
positive
, one
negative
Sodium oxide: Na<sub>2</sub>O, Two positive, two negative
Magnesium oxide
:
MgO
, Two positive, two negative
Magnesium chloride
:
MgCl<sub>2</sub>
, Two positive, two negative
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What is the formula for sodium chloride?
NaCl
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What is the formula for sodium oxide?
Na<sub>
2
</sub>O
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What is the formula for magnesium oxide?
MgO
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What is the formula for magnesium chloride?
MgCl
<sub>2</sub>
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