M1 Science Mid-Term Core Review

1. Aristotle and many ancient Greeks thought that all matter was made of how many elements?

• 1

• 4

• 8

• 12

Democritus believed that the universe was made of empty space and __________ .

• 1. molecules

• compounds

• 1. elements

• 1. atoms

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NGSS.MS-PS1-1

1. The three basic components of an atom are _____. 

• 1. protons, neutrons, and ions 

• 1. protons, neutrons, and electrons 

• 1. protons, neutrinos, and ions 

• 1. protium, deuterium, and tritium 

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NGSS.MS-PS1-1

1. The nucleus of an atom consists of _____. 

• 1. electrons 

• 1. neutrons 

• 1. protons and neutrons 

• 1. protons, neutrons, and electrons 

  
  

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NGSS.MS-PS1-1

1. Which is the smallest piece of an element that still represents that element?

• 1. a quark

• 1. an electron

• 1. an atom

• 1. a molecule

1. Which particles have almost the same mass? 

• 1. proton and electron 

• 1. proton and neutron 

• 1. electron and neutron 

• 1. all three particles 

1. What is true of all neutral atoms?

• 1. they have equal numbers of neutrons and electrons

• 1. they have equal numbers of protons and neutrons

• 1. they have equal numbers of protons and electrons

• 1. they have equal numbers of protons, neutrons and electrons

1. An atom containing six protons and six electrons has __________ charge.

• 1. a positive

• 1. no net

• 1. a negative

• 1. a strong negative

1. Why is the area around the nucleus in the modern atomic model called the electron cloud?

• 1. because it contains a dense cloud of many electrons

• 1. because the electrons are constantly moving

• 1. because scientists do not know how many electrons an atom has

• 1. because electrons are large and diffuse particles

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NGSS.MS-PS1-1

1. A fluorine atom contains 9 protons, 10 neutrons and 9 electrons. What is the atomic number of fluorine?

• 3

• 9

• 18

• 10

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NGSS.MS-PS1-1