Which of the following sublevels is correctly designated?

• 1p⁵

• 3f⁹

• 2p⁶

• 3d¹¹

Tags

NGSS.MS-PS1-1

Which configuration is possible in an excited state of electron?

• ₂He:1s²

• ₁H:1d¹

• ₁₁Na:1s² 2s² 2p⁶ 3d¹

• ₁₀Ne: 1s² 2s² 2p⁵ 3s¹

Tags

NGSS.HS-PS1-1

For a neutral atom with the electron configuration of 1s² 2s² 2p⁵ 3s¹ which statement is false?

• the atomic number is ten

• the 1s and 2s orbitals are filled

• the atom is in the ground state

• the atom is in the excited state

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Who proposed the probability that electrons will be found in certain locations around the nucleus of an atom?

• Neils Bohr

• Erwin Schrodinger

• Ernest Rutherford

• J.J. Thomson

Which of the following statements is NOT true of the atomic model of Bohr?

• The hydrogen is made up of a positively charged nucleus

• The electron revolves around the nucleus in a circular orbit

• The energy of the electron in a given orbit is not fixed

• An electron can absorb or emit a quantity of radiation

Which orbital designation has the highest energy?

• 2s

• 2p

• 3d

• 4s

Which electron transition results in the emission of energy?

• 3p to 3s

• 3p to 4p

• 2s to 2p

• 1s to 2s

Tags

NGSS.MS-PS4-1

Which state of matter does this picture show?

• Solid

• Liquid

• Gas

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Two or more elements chemically combined together are called a

• Element

• Compound

• Mixture

• Solution

The simplest natural substance is called a(n)

• Element

• Compound

• Mixture

• Solution