Unit 2 Quiz: Elements, Atoms, And Ions

Elements are pure substances _________________

Water is an element ______________

Chlorine is an element ___________________

The law of constant composition says that the composition of compounds changes according to the place of origin.  __________________

A chemical formula describes the shapes of the compound

The nucleus of an atom contains protons and neutrons ________________

Electrons are responsible for chemical properties of an atom __________

The atomic number of an atom is the sum of the protons and neutrons present in the nucleus of that atom. ___________

Chlorine has the atomic number of 17 _____________

A chart containing all of the known elements arranged in an organized fashion is called the periodic table ______________

Nonmetals can be pulled into wires and conduct electricity. _______________

Silicon, arsenic and germanium represent metals _________________

Nitrogen, oxygen and hydrogen exist as diatomic molecules ________________.

A negative ion is called a cation __________

The size of an atom increases when it obtains one or more electrons forming an ion. _______

In an ionic compound, both anions and cations must be present to form a molecule. ________

The formula for the compound containing Ba²⁺ and O^2- is BaO _________.

The formula for the compound containing Al³⁺ and S^2- is Al₂S_{3 _______________}

The formula for the compound containing K⁺ and P^3- is KP_{3 ___________}