Structure 1.2 Review

Which of the following statements is not true?

• I. Electrons have greater mass than protons and neutrons

• II. Protons and neutrons are in the nucleus

• III. Protons and electrons are charged subatomic particles

• IV. Electrons are located outside the nucleus

• I and III only

• II and IV only

• I only

• II only

The nuclear symbol for an isotope of iodine is shown. Which of the following is correct?

• Atomic number = 53

  Mass number = 125

  Protons = 53

  Neutrons = 72

  Electrons = 53

• Atomic number = 53

  Mass number = 125

  Protons = 72

  Neutrons = 53

  Electrons = 53

• Atomic number = 125

  Mass number = 53

  Protons = 53

  Neutrons = 72

  Electrons = 72

• Atomic number = 125

  Mass number = 53

  Protons = 53

  Neutrons = 53

  Electrons = 72

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-8

The atom of an element Q has an atomic number of 27 and a mass number of 60. Which of the following statements is true about the subatomic particles of the atom of element Q?

• I. Atom of element Q has 27 electrons and 60 protons

• II. Atom of element Q has 27 protons and 27 electrons

• III. Atom of element Q has 27 electrons and 60 neutrons

• IV. Atom of element Q has 27 protons and 33 neutrons

• I and IV only

• II and IV only

• II and III only

• I and III only

Tags

NGSS.MS-PS1-1

Which of the following is not a physical property of an isotope of an element with fewer neutrons in its atom?

• Lower mass

• Faster rate of diffusion

• Higher density

• Lower melting and boiling points

The isotopes of carbon ¹²C and ¹³C:

• I. have the same atomic number

• II. have the same physical properties

• III. have the same chemical properties

• I and III only

• I and II only

• II and III only

• I, II, and III

Tags

NGSS.HS-PS1-8

How many electrons are there in ³⁵Cl^1-?

• 17

• 18

• 35

• 36

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The following table shows the number of subatomic particles present in five species. Which two species are isotopes of the same element?

• A and B

• B and C

• C and D

• D and E

Bromine has 2 stable isotopes: bromine-79 and bromine-81. What is the relative atomic mass of bromine (Br)?

Isotope Abundance Atomic Mass

Bromine-79 50.69% 78.92

Bromine-81 48.31% 80.92

• 78.5

• 80.1

• 81.2

• 79.9

What is correct for the shown isotope?

• Protons = 29

  Neutrons = 34

  Electrons = 27

• Protons = 29

  Neutrons = 34

  Electrons = 31

• Protons = 34

  Neutrons = 63

  Electrons = 32

• Protons = 34

  Neutrons = 29

  Electrons = 27

Tags

NGSS.HS-PS1-1

Which values are the same for both Hydrogen-1 and Hydrogen-2?

I. boiling point

II. enthalpy of combustion

III. number of protons

IV. density

• I and III only

• I and IV only

• II and III only

• I, II, and III