Which quantity identifies an element?

1. Atomic number

2. Mass Number

3. total number of neutrons in an atom of the element

4. total number of valence electrons in an atom of the element

A student needs to use the metric system while measuring the length of a box. Which units should he use? centimeters inches feet yards

Will chlorine gas effuse more quickly than ammonia gas

Insulin, adrenaline, and estrogen are examples of

Which statement best describle for formation of solution

A disturbance in matter that carries energy from one place to another is called

Identify the precipitate (if any) that forms when KOH and Cu (NO3) 2 are mixed

An atom has a mass number of 27 and 14 neutrons. what is the atomic number of this atom?

The two forms of oxygen, O2 (g) and O3 (g), have (1) different molecular structures and identical properties (2) different molecular structures and different properties (3) identical molecular structures and identical properties (4) identical

What is the difference between a distraction and a reaction

if carbon which has an electrongavity of 2.5 bonds with hydrogen, which has an electrongavity of 2.1, the bond between the two atoms will be classified as a (n) covalent bond