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WorksheetsAtomic Structure
Total questions: 17
Worksheet time: 9mins
All matter has ___ and occupies space. The simplest form of matter containing only one type of atom with its own particular set of properties is called a(n) ___. A combination of two or more atoms that can be the same or different is called a(n) ___. Such combinations of atoms are held together by attractive forces, which help determine the ___ of matter.
mass; particle; element; mass
mass; element; molecule; state
elements; atom; molecule; mass
molecules; element; particle; state
A chemical formula presents information on the number and type of atoms that make up a compound or element, such as a gas.
Which of the following lists the gases in order of increasing number of atoms that make up its molecule?
Cl2; CH4; C2H4; CH2O; SO2
Cl2; SO2; CH2O; CH4; C2H4
SO2; CH2O; CH4; C2H4 ; Cl2
CH4; Cl2; SO2; CH2O; C2H4
The image shows a model of a lithium atom.
How many neutrons are in this lithium atom?
3
4
7
10
How many electrons does one neutrally charged atom of argon have?
18
22
40
58
How many neutrons are there in 226Ra?
88
138
226
314
Which of the following represents a pair of isotopes?
Ca+2,Be+2
12C, 14C
Fe+2, Fe+3
7N, 8O
Read the passage and use the diagram to answer the next question.
Silicon is the second most abundant element in Earth’s crust. It is used in the electronics industry to manufacture transistors, and in the construction industry to produce concrete and Portland cement.
The following graph shows the relative abundances of the naturally occurring silicon isotopes.
What could be the estimated atomic mass of Silicon?
26.2 amu
28.1 amu
29.8 amu
30.1 amu
What is the lowest possible energy level that an electron can occupy?
Excited state
Fundamental state
Ground state
Outermost state
If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?
3
4
5
6
How many electrons are located in the outermost orbit in the Bohr model of a boron atom?
1
2
3
4
The figure shows different possible transitions of electrons as they move from higher energy states to lower energy states. Which transition will produce the spectrum line with the lowest wavelength in this element’s atomic spectrum?
A
B
C
D
Read the passage and use the diagram to answer the next question.
Oxygen is perhaps the most important atom on Earth. It is responsible for life as we know it, and it is the most abundant atom in our planet. There are more oxygen atoms on Earth than all the other elements’ atoms combined. It was discovered as an atom by Antoine Lavoisier in 1777.
The image shows the Bohr atom model for Oxygen.
Which of the following electronic transitions in the oxygen atom will result in light emission?
ni = 1 ⟶ nf = 2
ni = 1 ⟶ nf = 3
ni = 3 ⟶ nf = 2
ni = 2 ⟶ nf = 3
Which atomic model uses atomic orbitals to describe the probable location of any electron in a three-dimensional space?
the cubic model
the plum-pudding model
the planetary model
the quantum mechanical model
The electron shell model of an atom has three main components: the energy shell, the subshell, and the orbital. Which of the following represent the correct arrangement from the lowest to highest maximum capacity to hold electrons?
orbitals < energy shell < subshell
energy shell < orbitals < subshell
subshell < orbitals < energy shell
orbitals < subshell < energy shell
The figure is a 3-dimensional representation of an atomic orbital. Which orbital does it represent?
an s-orbital
a single p-orbital
three d-orbitals
three p-orbitals
Read the passage and use the diagram to answer the next two questions.
The figure shows a 3D model of the shapes of a particular element’s atomic orbitals.
If all the orbitals shown in the 3D model are completely filled, how many electrons does this element have?
4
6
10
18
Choose the correct sequence of subshells represented in the diagram, in order from lowest to highest energy level.
1s > 2s > 3s
1s > 2p > 2s
1s > 2s > 2p
1s > 2s > 3s > 2p
