Pre-assessment

On the basis of Rutherford's model of an atom, which subatomic particle is present in the nucleus of an atom?

• A. proton and electron

• B. neutron and electron

• C. proton and neutron

• D. proton only

For a neutral atom with the electron configuration of 1s 2s 2p 3s", which statement is false?

• A. The atomic number is ten.

• B. The 1s and 2s orbitals are filled.

• C. The atom is in the ground state.

• D. The atom is in the excited state.

What are the orbitals present in the fifth principal energy level?

• A. s orbital

• B. s, p orbitals

• C. s. p, d orbitals

• D. s. p, d, and f orbitals

How many orbitals are in the third principal energy level?

• A. 3

• B. 6

• C. 9

• D. 2

If the first and second energy levels of an atom are full, then what would be the total number of electrons in the atom?

• A. 6

• B. 8

• C. 10

• D. 18

Which electron transition results in the emission of energy?

• A. 3p to 3s

• B. 3p to 4p

• C. 2s to 2p

• D. 1s to 2s

The symbol "n" in the Bohr theory of atomic structure refers to

• A. the energy of electron.

• B. the total energy of the atom.

• C. the number of electron in an energy level.

• D. the orbit in which an electron is found.

Which configuration is possible in an excited state of electron?

• A. 2He: 1s2

• B. 1H: 1d1

• C. 11Na: 1s²2s² 2p⁶3d¹

• D. 10Ne: 1s² 2s²2p(5)3s¹

Which of the following sublevels is correctly designated?

• A. 1p⁵

• B. 3f⁹

• C. 2p⁶

• D. 3d¹¹

Which atomic model is proposed by Schrodinger?

• A. nuclear model

• B. planetary model

• C. raisin bread model

• D. quantum mechanical model