Transcript Slide 1

Elements
1. Protons – changes element
Electrons – changes charge (makes ion)
Neutrons – changes mass (isotopes)
2. Becomes a +1
3. Top number = mass number
Bottom number = atomic number = protons
79 protons and 118 neutrons
Elements
4. The time required for half of an unstable
isotope to decay into another, more stable
isotope. (When a half life passes, half of the
isotope changes)
5 a. Alkali Metals – Group 1
b. Alkaline Earth Metals – Group 2
c. Transition Metals – d block (middle)
d. Inner Transition Metals – f block (bottom)
e. Halogens – Group 17
f. Noble Gases – Group 18
Elements
6 a. Electronegativity – the ability to attract
an electron in a chemical bond.
increase across, decrease down
b. Atomic radii – the size of an atom
decrease across, increase down
c. Ionization Energy – the energy requireed
to remove an electron from an atom.
increase across, decrease down