Final Exam Review - Principles of Chemistry

Which statement describes the structure of an atom?

• The nucleus contains positively charged electrons

• The nucleus contains negatively charged protons

• The nucleus has a positive charge and is surrounded by negatively charged electrons

Which subatomic particles are paired with their charges?

• electron–positive, neutron–negative, proton–neutral

• electron–negative, neutron–neutral,

  proton–positive

Which subatomic particles are found in the nucleus of an atom of beryllium?

• electrons and protons

• electrons and positrons

• neutrons and protons

How many different elements are represented by the diagrams?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

All phosphorus atoms have the same

• atomic number

• mass number

• number of neutrons plus the number of electrons

• number of neutrons plus the number of protons

An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of

• 4–

• 3–

• 3+

• 4+

Which electron configuration represents the distribution of electrons in a potassium atom in the ground state?

• 2-8-8-1

• 2-8-7-2

• 2-8-5

• 2-7-6

Which electron configuration could represent the electrons in a sodium atom in an excited state?

• 2-8

• 2-8-1

• 2-7-1

• 2-7-2

Tags

NGSS.HS-PS1-1

Which electron dot structure is drawn correctly for the atom it represents?

• (Image 1)

• (Image 2)

• (Image 3)

• (Image 4)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom with a neutral charge has the same number of

• Protons and electrons

• Neutrons and electrons

• Protons and neutron

• Electrons and positrons