A number placed in front of an element symbol

Write a lewis structure for the co2-3 ion. how many equivalent resonance structures can be drawn?

Which one of the following types of exercise involves abrupt, explosive movement? A. Isometric B. Isokinetic C. Plyometric D. Isotonic

Why are roman numerals used in naming compounds that contain transition metals?

The copper burned in the presence of another substance to form the dark coating on the wire what was that other reactant? A. Water B. Oxygen gas C. Copper oxide D. Carbon (The answer is not C I already tried this on the test.)

If the neutral solution was boiled to dryness, what would be the formula of the resulting salt.

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?

Which of the following characteristics do all plants share? a. being unicellular b. producing flowers c. being a prokaryote d. being an autotroph

Electrons have A) A positive charge and relatively low mass B) A negative charge and relatively high mass C) A neutral charge and relatively high mass D) A negative charge and relatively low mass

What are the main reactants and products in a neutralization reaction?

Which condition will release more energy when an electron changes levels? From n = 4 to n = 3 from n = 3 to n = 2 from n = 2 to n = 1