Atomic Structure Review

Correctly classify the following as an element or a molecule:

Li

• molecule

• element

Correctly classify the following as an element or a molecule:

He

• molecule

• element

Correctly classify the following as an element or a molecule:

H

• molecule

• element

Correctly classify the following as an element or a molecule:

H₂O

• molecule

• element

Tags

NGSS.MS-PS1-1

Correctly classify the following as an element or a molecule:

O₃

• molecule

• element

Tags

NGSS.MS-PS1-1

Correctly classify the following as an element or a molecule:

CaO

• molecule

• element

Tags

NGSS.MS-PS1-1

​ (a)   has the greatest kinetic energy. Compound in the ​ (b)   state have the greatest kinetic energy because their particles are moving the fastest. Compounds in the ​ (c)   state will have the lowest thermal energy.

• nitric oxide (g)
• sodium oxide (s)
• water (l)
• gaseous
• liquid
• solid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following statements about the properties of elements related to an atomic emission spectrum are true? Select all that apply.

• An atomic emission spectrum occurs when an element in the gaseous state absorbs energy, and emits light that corresponds to the energies of specific electrons.

• An atomic emission spectrum occurs when an element in the solid state absorbs energy, and emits light that corresponds to the energies of specific electrons.

• The light that an element emits is made up of a limited number of narrow lines of light that produce a unique pattern, or atomic emissions spectrum, for that element.

• An atomic emission spectrum shows the pattern formed when light emitted by an element is separated into its different component wavelengths.

• An atomic emission spectrum shows the pattern formed when light absorbed by an element is separated into its different component wavelengths.

Tags

NGSS.MS-PS4-1

A chemistry graduate student is very skilled at analyzing atomic emission spectra. The printout of her spectrum is printed in black and white. Therefore, she has to rely on comparing the widths and positions of spectral lines during analysis. Which of the elements shown makes up the unknown spectrum?

• hydrogen

• helium

• sodium

• copper

• strontium

Tags

NGSS.HS-PS4-1

Which pattern(s) may be observed from the arrangement of elements in the periodic table? Select all that apply.

• increasing number of protons

• similarity in the number of their valence electrons

• similarity in their physical and chemical properties

• increasing relative abundance on Earth's surface

Tags

HS-PS1-A-2