Think you’ve got your head wrapped around Atoms, Molecules, and Ions? Put your knowledge to
the test. Good luck — the Stickman is counting on you!
Q. Which of the following statements is incorrect?
A molecule is the smallest part of a compound that can have a stable independent existence.
Molecules that consist of more than one atom are called polyatomic molecules.
The atomic number of an element is defined as the number of neutrons in the nucleus.
Compounds are composed of more than one kind of atom.
The charge on an electron is negative, and the charge on a proton is positive.
Q. Which of the following statements is not an idea from Dalton's Atomic Theory?
An element is composed of extremely small indivisible particles called atoms.
All atoms of a given element have identical properties which differ from those of all other elements.
Atoms can only be transformed into atoms of another element by nuclear reactions.
Compounds are formed when atoms of different elements combine with each other in small whole-number ratios.
The relative number and kind of atoms are consistent in a given compound.
Q. The number of protons in a nitrogen atom is:
28
14
32
7
47
Q. Which of the following elements in its pure stable form exists as a diatomic molecule?
Carbon
Nitrogen
Sulfur
Phosphorus
Iron
Q. Identify the incorrect statement below:
The atomic weight is the number of atoms in one mole of the element.
The electron and proton have charges of equal magnitude and opposite sign.
The atomic number is the number of protons in the nucleus.
An atom is the smallest particle of an element that maintains the chemical identity of that element.
The number above the element symbol on the periodic chart is the atomic number.
Q. The number of protons in a silicon atom is:
28
14
32
16
47
Q. A doubly negative ion, symbolized by X-2, forms a compound with a metal M, of the formula M2X. What is the charge on the metal M?
+1
+2
+3
+4
-2
Q. Which of the following has a net positive charge?
An anion
A cation
An electron
A neutron
None of the above
Q. Which of the following has a net negative charge?
An anion
A cation
A proton
A neutron
None of the above
Q. A cation and an anion are types of _______.
molecules
atoms
compounds
isotopes
ions