Parts of the atom
What charge do electrons have?
Negative (-)
What is the atomic symbol given to sodium?
Na
What does an atom's atomic number represent?
The amount of protons in the atom's nuclues.
When an atom's positive and negative charges cancel each other out, we can say the atom has a ________ charge.
Neutral
What is the smallest out of the three subatomic particles found in atoms?
a) electrons
b) neutrons
c) protons
What element has an atomic number of 35?
Bromine
What atomic mass does Cobalt have?
58.9
What is an isotope?
An atom with the same number of protons but a different number of neutrons.
What sub-atomic particles (protons, neutrons and electrons) are found in the nucleus of atoms?
What is an isotope?
An atom with the same number of protons but different number of neutrons
By atomic number (or number of protons in an atom).
CL is the atomic symbol for chlorine. It has an atomic number of 17 and an atomic mass of 35.4.
Use your periodic table to find what is wrong with the sentence above.
The chlorine atomic symbol is Cl, not CL.
capitalisation matters.
Electrons are found outside of the nucleus in electron shells. These shells make up a larger electron ________, which is x100 bigger than the nucleus.
Electron cloud
What is an example of two reactive elements bonding together to form a stable compound?
sodium and chlorine NaCL.
An isotope of chlorine is chlorine-39. This isotope has an atomic number of 17 and a mass number of 39. How many neutrons does the isotope have?
Number of nuetorons= atomic Mass - Atomic number
22
74
Crystal-lattice structures that extend in all directions with repeating patterns are properties of:
a) elements
b) compounds
c) molecules
c) molecules