Study atom_ practice Quiz

How many of the following did Dalton not discuss in his atomic theory?

isotopes

ions

protons

electrons

neutrons

• 1

• 2

• 3

• 4

• 5

Which of the following statements are true?

I. Models are always wrong unless they are proved by a theory.

II. Elements, such as lead, are made of tiny particles that mostly consist of open space.

III. The air you breathe is an example of a heterogeneous mixture.

IV. Because NH₃ always contains the same relative numbers of atoms, it will always contain 4.6 g of nitrogen for every 1.0 g of hydrogen.

• II only

• II, IV

• I, II, IV

• I, III

• All of the above statements are true.

Tags

NGSS.MS-PS1-5

In chemistry, a formula is used to represent

• a compound

• an element

Which of the following statements is/are true?

I. John Dalton provided the first experimental support for the atom.

II. Ernest Rutherford proved the existence of a nucleus by shooting positively charged particles at a thin gold-foil sheet.

III. J. J. Thompson proved that electrons travel in elliptical orbits around the nucleus.

IV. Energy in an atom is quantized, so when electrons fall to their ground state, white light can be observed.

• I, II

• I, III

• I, II, III

• II, IV

• All of the above statements (I – IV) are correct.

Tags

NGSS.MS-PS1-1

The first scientist to develop the theory that all atoms of a given element are identical was

• John Dalton

• J. J. Thomson

• Lord Kelvin

• Ernest Rutherford

• James Chadwick

Which atomic particle determines the chemical behavior of an atom?

• proton

• electron

• neutron

• nucleus

• none of these

Which of the following are the three main subatomic particles?

• Protons, Neutrons, Electrons

• Atoms, Molecules, Compounds

• Ions, Isotopes, Elements

• Quarks, Leptons, Bosons

Which particle has the smallest mass?

• neutron

• proton

• electron

• helium nucleus

How many protons, electrons, and neutrons, respectively, does ³¹P have?

• 15, 15, 16

• 15, 16, 15

• 16, 15, 31

• 15, 15, 31

• 15, 31, 16

Tags

NGSS.MS-PS1-1

Which of the following statements are true?

I. The number of protons in an element is the same for all neutral atoms of that element.

II. The number of electrons in an element is the same for all neutral atoms of that element.

III. The number of neutrons in an element is the same for all neutral atoms of that element.

• I, II, and III are all true.

• Only I and II are true.

• Only II and III are true.

• Only I and III are true.

• I, II, and III are all false.