Atomic Structure and the Periodic

Which of the following is not apart of Dalton's Atomic Theory?

• Atoms are indivisible

• Atoms are characterized by their atomic number

• The atoms of an element have identical properties

• The atoms of an element differ from those of other elements

Which of the following factors is important in determining the stability of an isotope?

• Size of atomic radius

• Number of protons

• Number of protons to electrons

• Ratio of protons to neutrons

Tags

NGSS.HS-PS1-8

Atomic Mass (Amu)           Abundance %
204 Pb                                  1.4

206 Pb                                  24.1

207Pb                                   22.1

208 Pb                                  52.4

Based on the data above what is the relative atomic mass of lead is...

• 206.24 amu

• 207.24 amu

• 207.30 amu
  
  

• 208.30 amu

Tags

NGSS.HS-PS1-8

• A

• B

• C

• D

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

What is the average relative atomic mass of bromine, given the following isotopic masses and abundances?

⁷⁹Br 50.5% ⁸¹Br 49.5%

• 80.01

• 79.99

• 79.90

• 78.99

• A
         N
  Z-1  

• A-4
        N
  Z

• A-4
         N
  Z+1

• A-4
        N
  Z-1

Tags

NGSS.HS-PS1-8

Which of the following types of radiation is composed of particles with a charge and mass identical to that of an electron?

• Alpha particles

• Beta particles

• Gamma rays

• X-rays

The explanation for how a beta particle is produced in the nucleus of a radioisotope and then ejected involves the conversion (in a complex series of steps) of a

• proton converted to neutron and electron

• neutron converted to a proton and electron

• proton converted to electron

• neutron converted to an electron

Tags

NGSS.HS-PS1-8

The mass number remains constant during which of the following modes of decay?

• Alpha

• Beta

• Gamma

• none of the above

Tags

NGSS.HS-PS1-8

Which of the following statements concerning subatomic particles is correct?

• Four fundamental types exist, all of which are charged

• Four fundamental types exist, two of which are charged.

• Three fundamental types exist, none of which are charged.

• Three fundamental types exist, two of which are charged.