Atom
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Subatomic particles that do not possess any charge but provide mass to atoms are called _____.
neutrons
Atoms of helium or nickel would represent _____. These are pure substances that can not be broken down into simpler materials or particles.
elements
What is contained in the nucleus of an atom?
protons and neutrons
A neutral atom has equal numbers of ____ and electrons.
protons
What is all matter made of?
atoms
Which statement(s) is/are FALSE?
All atoms are about the same size. Protons and neutrons repel each other and position themselves far apart inside the atom.
The radius of an atom is closest in size to which of the following units?
1 Nanometers
Which of the following statements is true about the atoms of any element?
All the atoms of a given element are identical in that they have the same number of protons.
What do all atoms of the same element have in common?
number of protons
Atoms are the smallest particles in the universe.
False
In a neutral atom, the number of protons is equal to the number of electrons.
True