The Atom
The nucleus of an atom has a
Dense, positively charged central core
An electron has a charge of
-1
These types of electrons are shared
Valence
Pure water at 25°C has a pH level of
7
What nuclear emission is negatively charged
Beta particle
Neutral atoms must contain equal numbers of
electrons and protons
One similarity between all mixtures and compounds is
Heterogeneous
This process releases energy
Exothermic
This range indicates the pH level of acidity.
0-6.
Which particle has the greatest mass
Alpha particle
This particle has the smallest mass
Electron
The atomic number of an atom is always equal to the number of its
protons
This process absorbs or requires energy
Endothermic
Bases react with acids to produce
Water and a salt.
During a fission reaction, which type of particle is captured by a nucleus
A neutron
The scientist who discovered the nucleus is
Rutherford
The total number of neutrons that an element has with a mass number of 19 and an atomic number of 9 is
10
This compound forms crystals and has a rigid shape
Ionic
As a strong acid is added to a beaker containing NaOH, the number of OH- ions in the beaker
Decreases
The course of a chemical reaction can be traced by using a
Radioisotope.
The tool that was created to identify elements is
The Bunsen Burner
The state that does have a definite volume and but no definite shape is
Liquid
The strength of an atom's attraction for the electrons in a chemical bond is the atom's
Electronegativity
When an Arrhenius base is dissolved in H2O, the only negative ion present in the solution is
OH-
How many years are required for potassium-42 to undergo three half-life periods
37.2 hours