What particles are located within the nucleus of an atom?
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protons and electrons
protons and neutrons
electrons and neutrons
The correct answer is protons and neutrons.
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
The correct answer is to subtract the number of protons from the mass number to find the number of neutrons in an atom.
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 correct answer is 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
The correct answer is an extended structure.
Use the periodic table to answer the question.
Which Statement about magnesium [Mg] and calcium [Ca] is correct?
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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.