How do we find the number of neutrons in an atom?
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Add the atomic number and mass number together
Subtract the number of electrons from the number of protons
Subtract the number of protons from the mass number
Subtract the atomic number from the mass number
Which of the following does the atomic number of an atom or element represent?
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The number of protons in the atom
The number of neutrons in the atom
The number of particles in the nucleus of the atom
The number of protons in the atom
A molecule of ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom. A ball-and-stick model of a molecule of ethanol is made from the following components:
one red ball
two black balls
six white balls
eight sticks
What do the white balls in this model represent?
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Carbon atoms
Bonds between atoms
Hydrogen atoms
The white balls in the model represent hydrogen atoms.
Which term describes the repeated arrangement of the same molecule?
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bonds
extended structure
molecular model
extended structure
Use the periodic table to answer the question.
Which Statement about magnesium [Mg] and calcium [Ca] is correct?
They are both classified as noble gases.
They both have the same number of valence electrons.
They both have the same number of electron shells.
The statement "They both have the same number of electron shells" is correct.
What property do elements in group 18 [or 8] most likely share?
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They are silver in color.
They are malleable.
They have low or no reactivity.