Atomic Model

How do scientists know how atoms are structured?

• By looking under a microscope
• By running experiments that expose their properties
• By examining only the largest atoms
• By splitting them apart

What contribution did John Dalton make to atomic theory?

• he dsicovered that every atom was positively charged
• He discovered that every element consisted of one type of atom
• He discovered that atoms had nuclei
• He discovered that atoms could be divided into smaller parts

Place the following scientists in order, from earliest to latest: A) Enest Rutherford; B) J.J. Thomsonl C) John Dalton

• B, C, A
• C, A, B
• A, C, B
• C, B, A

The majority of an atom's mass exists where?

• In the nucleus
• In the electron cloud
• In the space between the nucleus and the electrons
• In the neutrons

What are electrons?

• Positively charged particles
• Neutrally charged particles
• Negatively charged particles
• Uncharged particles

Tags

NGSS.MS-PS2-3

Ernest Rutherford discovered that atoms were mostly:

• Negatively charged
• Positively charged
• Electrons
• Empty space

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RNA

How are neutrons different from protons and electrons?

• They are massive than protons and electrons
• they have no electrical charge
• They are less massive than protons and electrons
• Protons and electrons exist in atomic nuclei; neutrons orbit the nucleus in a "cloud"

Which of the following is the philosopher credited with coining the term "atomos"?

• Socrates

• Aristotle

• Plato

• Democritus

An atom is electrically neutral because

• the numbers of protons and neutrons are equal.

• the numbers of protons and electrons are equal.

• neutrons balance the protons and electrons.