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monster
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gift
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fairy
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thief
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Why does argon not react with other elements?
Ar is a noble gas. Noble gasses have a full valence shell, so they are energetically stable
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10
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How many valence electrons does oxygen have?
Oxygen (O) is in group 16, so it has 6 valence electrons
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15
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What did the gold foil experiment prove?
Atoms are mostly empty space, with a small, dense, positively-charged center
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lifesaver
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magnet
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fairy
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thief
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baam
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shark
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shark
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banana
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15
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In a chemical change, what happens to the organization of the atoms?
Chemical bonds between atoms are broken and new bonds form. Atoms rearrange.
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10
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How many protons does sulfur have?
Sulfur's atomic number is 16, so it has 16 protons
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Why does sulfur form an anion with a charge of 2- ?
Sulfur has 6 valence electrons, so it wants two more to fill its valence shell
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20
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List 3 signs of a chemical change
Heat, light, color change (usually), bubbles, new substance
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15
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How many electrons does a neutral atom of calcium have?
Calcium's atomic number is 20, so it has 20 protons. A neutral atom has the same number of protons and electrons, so 20.
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What is the most common isotope of silicon?
Silicon-28
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10
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What is matter?
Anything that has mass and volume
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15
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Which two subatomic particles have an approximately equal mass?
Protons and neutrons weigh about 1 amu
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25
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Hydrogen has three isotopes. H-1 abundance: 99.98%. H-2: 0.012%. H-3: 0.008% Calcuate avg atomic mass.
To find: sum the mass of each isotope * it's abundance. (1)(0.9998) + (2)(0.00012) + (3)(0.00008) = 1.0002
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eraser
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magnet
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fairy
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baam
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