Atomic structure and electron configurations

Which of these is the largest planet in the Solar System?

• Earth
• Mars
• Mercury
• Jupiter
• Pluto

Tags

NGSS.MS-ESS1-3

How many neutrons does an atom of U-238 have?

• 92
• 146
• 238
• 3

Tags

NGSS.MS-PS1-1

Chlorine has an atomic number of 17 and a mass number of 35. It has _________.

• 17 protons, 17 electrons, and 18 neutrons.
• 17 protons, 17 electrons, and 52 neutrons.
• 35 protons, 35 electrons, and 17 neutrons.
• 18 protons, 18 electrons, and 17 neutrons.

Tags

NGSS.MS-PS1-1

An atom of Neon has ____electrons.

• 20
• 5
• 10
• 12

Tags

NGSS.MS-PS1-1

An atom that has 54 protons, 54 electrons, and 78 neutrons has an isotope notation of _________.

• ⁵⁴₇₈Xe

• ⁵⁵₂₃₁Cs

• ⁵⁴₁₃₂Xe

• ⁷⁸₅₄Pt

Tags

NGSS.MS-PS1-1

An isotope that has 20 protons, 20 electrons, and 23 neutrons has an isotopic notation of:

• ⁴³₂₀Ca

• ⁴³₂₂Ca

• ⁴³₂₃Ca

• ⁴³₂₄Ca

Tags

NGSS.MS-PS1-1

 Which of the following atoms has the highest ionization energy?

• Si
• As
• Al
• P

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵?

• Cl
• I
• Se
• Br

Tags

NGSS.MS-PS1-1

The electrons available to be lost, gained, or shared when atoms form molecules are called _________.

• electron clouds
• valence electrons
• ions
• p electrons

Tags

NGSS.MS-PS1-1

Valence electrons are ____ electrons

• inner
• square
• outer
• triangular

Tags

NGSS.MS-PS1-1