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Elements are made up of tiny particles called atoms.
Atoms are not created or destroyed in chemical reactions.
All atoms of a given element are identical.
Atoms are indivisible in chemical reactions.
All of these statements are true according to modern atomic theory.
An atom is mostly empty space.
Almost all of the mass of the atom is concentrated in the nucleus.
The protons and neutrons in the nucleus are very tightly packed.
The number of protons and neutrons is always the same in the neutral atom.
All of the statements given are true.
75 protons, 75 neutrons.
75 protons, 130 neutrons.
130 protons, 75 neutrons.
75 protons, 110 neutrons.
Not enough information is given.
Ions are formed by adding electrons to a neutral atom.
Ions are formed by changing the number of protons in an atom’s nucleus.
Ions are formed by removing electrons from a neutral atom.
An ion has a positive or negative charge.
Metals tend to form positive ions.
K, alkali metal
Ba, alkaline earth metal
Ne, noble gas
Ni, transition metal
Pb(NO3)2, lead (II) nitrate
NH4ClO4, ammonium perchlorate
PO4 3-, phosphate ion
Mg(OH)2, magnesium hydroxide
NO3 -, nitrite ion