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How many protons are present in a lithium atom?
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2. Atoms & Elements
The Atom
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Which of the following statements is true about atoms?
A
Atoms are always electrically neutral.
B
Atoms have a fixed number of electrons that cannot change.
C
Atoms are indivisible and cannot be broken down into smaller particles.
D
Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons.
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Understand that atoms are the basic units of matter, consisting of a nucleus and electrons.
Recognize that the nucleus of an atom contains protons, which are positively charged, and neutrons, which have no charge.
Identify that electrons, which are negatively charged, orbit the nucleus in various energy levels or shells.
Acknowledge that atoms are not always electrically neutral; they can gain or lose electrons, forming ions.
Realize that atoms are divisible into subatomic particles: protons, neutrons, and electrons, contrary to the outdated notion of being indivisible.
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