Atoms Flashcards
What is the nucleus?
- middle of the atom
- contains protons and neutrons
- positive charge
What are the electrons
-move around the nucleus in electron cells
Are electrons positive or negative?
Negatively charged
Do electrons have mass
No
What is the relative mass of proton, neutron and electron?
Proton = +1
Neutron = 0
Electron = - 1
Are the number protons the same as the number of electrons?
They are equal
What is an ion?
An atom or group of atoms that has lost or gained electrons?
What is the nuclear symbol
The nuclear symbol of an atom tells you its atomic (proton) number and mass number?
What is the atomic number?
Proton number
What is the mass number?
It tells you the total number of protons and neutrons in the atom
How do you figure out the numbers of neutrons?
You subtract the atomic number from the mass number?
On a nuclear symbol is the mass number at the top or the bottom?
Top
The atomic number is at the bottom.
What is the radius of atoms?
0.1 nanometers
