What charge are the particles in the cloud that surround the nucleus of an atom?
Negative
A certain element has 12 neutrons and 11 protons. Assume this element has an overall neutral charge. What is the identity of this element?
Sodium (Na)
A neutral atom with 15 protons has ______ valence electrons.
Five (5)
Atomic number is equal to the number of ________.
protons
The number of valence electrons in an atom determines its -
chemical reactivity.
What is found in the nucleus of an atom?
Protons and neutrons
What are the three subatomic particles and their charges?
Proton: positive Neutron: neutral electron: negative
Which subatomic particle has the least mass?
Electron
How many valence electrons does one atom of Oxygen (O) contain?
Six (6)
What group contains the Noble Gases?
Group 18
Why do noble gases have such a low reactivity?
Their outer shells of their electron clouds are full.
What element is located in Group 15 and Period 2?
Nitrogen (N)
How many atoms are in 2(Ge2O3)?
10
Name the elements in the equation. CO2 + H2O ? C7H8O2
Carbon, Hydrogen, and Oxygen
How many elements in the following? RbNO3
3
New substances formed during a chemical reaction are on the _____ side and are called ______
Right side; Products
