1.
- Particle: Proton, Charge type: Positive, Charge: +1
- Particle: Neutron, Charge type: Neutral, Charge: 0
- Particle: Electron, Charge type: Negative, Charge: -1
2. The nucleus has a positive charge and consist of protons and neutrons.
3. Electrons are located in the electron cloud (or orbitals/shells) of an atom and carry negative charge.
4. The number of protons in one atom of an element determines the atom's atomic number, and the number of electrons determines the chemical properties (or reactivity/valence) of an element.
5. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the Periodic Table. No two different elements will have the same atomic number.
6.
- Beryllium: Be, 4
- Fluorine: F, 9
- Magnesium: Mg, 12
- Sulfur: S, 16
- Cobalt: Co, 27
- Tin: Sn, 50
- Arsenic: As, 33
- Gold: Au, 79
7.
- Potassium: K, 19
- Argon: Ar, 18
- Calcium: Ca, 20
- Chromium: Cr, 24
- Cadmium: Cd, 48
- Lead: Pb, 82
8.
- Cesium-133: ¹³³Cs, neutrons = 133 - 55 = 78
- Iron-54: ⁵⁴Fe, neutrons = 54 - 26 = 28
- Ruthenium-106: ¹⁰⁶Ru, neutrons = 106 - 44 = 62
- Nickel-58: ⁵⁸Ni, neutrons = 58 - 28 = 30
- Polonium-209: ²⁰⁹Po, neutrons = 209 - 84 = 125
- Iodine-135: ¹³⁵I, neutrons = 135 - 53 = 82
- Indium-115: ¹¹⁵In, neutrons = 115 - 49 = 66
- Phosphorous-31: ³¹P, neutrons = 31 - 15 = 16
Parent Tip: Review the logic above to help your child master the concept of printable chemistry worksheet.
