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Atomic structure
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14-The group no. = the no. of electrons in outer shells ( valence electrons )
True
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9-Number of neutrons is equal to mass no. - atomic no.
True
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16-The atom is neutral (uncharged) in ordinary state because .........................
no. of protons = no. of electrons
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12-Locate the position of 20Ca in the modern periodic table Mg ( 2, 8,8, 2 )
period 4 - group 2
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5. What is the mass number of aluminum (Al)?
27
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15-What is the electron configuration of nitrogen ..........
2,5
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13-The period no. = the no. of shells
True
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7-The _________ equals the number of protons in an atom of that element
atomic number
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18-..................Shows an element's chemical symbol, atomic number, atomic mass and symbol for state of matter at room
element key
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2. How many electrons are in an atom of carbon (C)? (Remember : Atomic Number = no. of Protons or no. of Electrons)
6
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6-The dense, positively charged mass located in the center of the atom.
nucleus
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10-Where are electrons found in an atom?
in the energy levels
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1. All elements are composed of.................
molecules
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3- How many neutrons are in an atom of sodium (Na)? (Remember : Neutrons no. = Mass no. - Atomic no. )
23 - 11 = 12
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4. Atoms of the same element must always have the same number of _________
protons
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8-The __________ is the sum of the protons and neutrons in the nucleus of that atom.
mass number
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11-The chemical symbol of magnesium is ....................
Mg
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17-The nucleus is positively charged because it has...
positive protons and Neutrons (no charge)
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19-The electron configuration of potassium is ..............
2, 8, 8, 1
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