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eraser
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rocket
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fairy
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25
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thief
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15
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15-What is the electron configuration of nitrogen ..........
2,5
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6-The dense, positively charged mass located in the center of the atom.
nucleus
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5. What is the mass number of aluminumย (Al)?
27
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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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8-The __________ is the sum of the protons and neutrons in the nucleus of that atom.
mass number
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13-The period no. = the no. of shells
True
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heart
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star
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shark
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lifesaver
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15
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10-Where are electrons found in an atom?
in the energy levels
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7-The _________ equals the number of protons in an atom of that element
atomic number
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15
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11-The chemical symbol of magnesium is ....................
Mg
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gold
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fairy
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baam
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14-The group no. = the no. of electrons in outer shells ( valence electrons )
True
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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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15
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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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