What must be true of the element represented by the "X"?
A It will have 6 total electrons.
B It will have chemical properties similar to C.
C It will have 28 protons.
D It will have a mass greater than 30.
B. It will have chemical properties similar to C.
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20
Which of the following is true for elements listed in the same column of the periodic table?
A have similar chemical properties.
B have the same number of protons.
C mass of their atoms are similar.
Datoms are the same size
A. they have similar chemical properties
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15
Why are noble gases nonreactive/ stable/ or least reactive?
these atoms have full outershells.
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15
A student hypothesizes that sodium (Na) has different chemical properties than magnesium (Mg). Which of the following statements bests supports this studentâs hypothesis?
Sodium and magnesium have different numbers of valence electrons.
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15
Why is this family, the Halogens, the most reactive NONMETAL family?
They are anxious to fill their last spot on their outershell.
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20
Based on the periodic table what do you know about these elements?
They all have the number of energy levels/shells.
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15
Based on the Periodic Table, which of the following elements has physical and chemical properties most like potassium?
A Sodium
B Calcium
C Bromine
D Neon
A. Sodium
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15
What is the family group # and period for this element?
group 5. period 2
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15
What characteristic of an element is the best indicator for determining what other elements it will react with?
a. The number of valence electrons of the element
b. The atomic mass of the element
c. The number of neutrons of the element
A. the number of valence Electrons
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15
What color is the blue section of the periodic table.
The Metals
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15
Which of the following lists of properties best describes nonmetals?
A. brittle, shiny, conductor
B. malleable, shiny conductor
C. brittle, dull, insulator
D. Malleable, dull, insulator
C. Brittle, dull, insulator
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10
Why is the group alkali metals the most reactive metals?
Alkali metals only have one valence electron.
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15
Valence Electrons determie the __________________ .