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Atomic Fundamentals

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Questions and Answers

Which one of these is true about atoms?

Atoms are the smallest part and building block of elements

Atoms are made up of neutrons, protons, and electrons

Atoms have the same number of protons and electrons

All of the above (correct)

What are neutrons and protons?

Neutrons and protons are located in the nucleus of an atom (correct)

Neutrons and protons revolve around the nucleus in an orbital

Neutrons and protons have a positive charge

Neutrons and protons are elementary particles

What is the charge of an electron?

Positive (+)

Negative (+) (correct)

Neutral

None of the above

What is the mass of an electron relative to a proton?

0.0005 Signup and view all the answers

What is the atomic number of an element?

The number of protons in an atom Signup and view all the answers

Which model of atoms was used until the early 1900s?

The solid sphere model Signup and view all the answers

What did the solid sphere model of atoms fail to explain?

Chemical reactions Signup and view all the answers

What are the sub-atomic particles that make up an atom according to the new model?

Protons, neutrons, and electrons Signup and view all the answers

Where are protons and neutrons located within an atom?

In the nucleus Signup and view all the answers

Why are atoms electrically neutral?

Because they have an equal number of protons and electrons Signup and view all the answers

Which of the following correctly describes the composition of an atom's nucleus?

The nucleus is made up of protons and neutrons. Signup and view all the answers

What is the overall electric charge of an atom?

Neutral Signup and view all the answers

Which of the following statements about the mass of an atom is true?

The mass of an atom is concentrated in its nucleus. Signup and view all the answers

What is the atomic number of an arsenic atom?

33 Signup and view all the answers

What did the early 1900s model of atoms fail to explain?