WorksheetsElectrons and Energy Level, Electron Configuration
Total questions: 13
Worksheet time: 5mins
Which atomic model is characterized by orbiting electrons around the atom’s nucleus?
Planetary model
Nuclear atomic model
Raisin bread atomic model
Quantum mechanical model
Who is the scientists that explained that there is only a probability that the electron can be found in a certain volume in space around the nucleus using mathematical calculations?
Neils Bohr
Werner Heisenberg
Louis de Broglie
Erwin Schrodinger
Valence electron is the number of electrons in the outermost energy level of an atom. Which of the following pairs of elements and valence electrons is incorrect?
Al - 3
Br - 7
S - 4
Sr - 2
Electron configuration shows the distribution of electrons in an atom. Which configuration is possible in an excited state of an electron?
He2: 1s2
C6: 1s2 2s1 2s3
Ne10: 1s2 2s2 2p5 3s1
Na11: 1s2 2s2 2p6 3d1
Which of the following sublevels is correctly designated?
2s3
3f9
2p6
4d11
Which electron configuration represents a neutral atom of nitrogen with 7 electrons?
1s2 2s1 2p4
1s2 2s2 2p3
1s1 2s1 2p5
1s2 2s2 2p4
A neutral atom has an electron configuration of 1s2 2s2 2p6 3s2. Which of the following statements is INCORRECT?
The atom is in a ground state.
The atom is in an excited state.
The atom has 12 electrons.
2s and 2p orbitals are filled completely.
Which element has correct electron configuration?
Ca20 – 1s2 2s2 2p6 3s2 3p6 4s2
Al 13 – 1s2 2s2 2p4 3s2 3p3
Mg12 –1s2 2s2 2p8
K 19 – 1s2 2s2 2p6 3s3 3p6
Which statement about an electron's orientation on its energy level is INCORRECT?
Orbital is a region where an electron can be found.
An electron can absorb energy when it jumps to a higher energy level.
An electron can emit energy when it jumps to a higher energy level.
Filling an electron in an atom starts from lower energy to highest energy level.
A green color was observed in the flame test of a barium salt. The energy producing this color is emitted when ______.
electrons in the highest levels are expelled
electrons drop back to lower energy levels
oxidation takes place
electrons are raised to higher energy levels by the heat of the flame
The way in which electrons are distributed in the different orbitals around the nucleus of an atom is called electron configuration. Which of the following is the correct electron configuration of Potassium (Atomic Number 19)?
1s2 2s2 2p6 3s2 3p6 3d1
1s2 2s2 2p6 3s2 3p5 3d2
1s2 2s2 2p6 3s2 3p6 4s1
1s2 2s2 2p6 3s2 3p7
What happens when a neutral atom forms a positively charged ion?
gains one or more electrons
gains one or more protons
loses one or more protons
loses one or more electrons
Atoms either lose or gain electrons in forming bonds with each other. Which of the following statements is FALSE?
Anions are negatively charged ions.
An element that loses an electron is a cation.
Covalent bond is due to the attractions between cation and anion.
The ionic bond is due to attractive forces between cations and anions.
