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15
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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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6-The dense, positively charged mass located in the center of the atom.
nucleus
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seesaw
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seesaw
Swap points!
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fairy
Take points!
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25
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banana
Go to last place!
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15
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16-The atom is neutral (uncharged) in ordinary state because .........................
no. of protons = no. of electrons
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15
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9-Number of neutrons is equal to mass no. - atomic no.
True
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15
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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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15
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10-Where are electrons found in an atom?
in the energy levels
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15
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4. Atoms of the same element must always have the same number of _________
protons
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baam
Lose 10 points!
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seesaw
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gift
Win 20 points!
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thief
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15
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1. All elements are composed of.................
molecules
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17-The nucleus is positively charged because it has...
positive protons and Neutrons (no charge)
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15
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15-What is the electron configuration of nitrogen ..........
2,5
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14-The group no. = the no. of electrons in outer shells ( valence electrons )
True
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thief
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star
Double points!
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shark
Other team loses 20 points!
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thief
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15
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13-The period no. = the no. of shells
True
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15
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19-The electron configuration of potassium is ..............
2, 8, 8, 1
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