Atoms and Subatomic Particles
What are the three main subatomic particles?
Protons, neutrons and electrons
For an atom to become an ion, it can ______ or lose electrons.
gain
What does the atomic number represent?
number of protons
In what year did the Brisbane Broncos win their first NRL premiership?
1992
Balance:
H₂ + Cl₂ → HCl
H₂ + Cl₂ → 2HCl
Where are protons and neutrons found?
Nucleus of the atom
An atom has an electron configuration of 2,6. This would be an atom of..
oxygen
Which group contains very reactive metals?
Group 1 (alkali metals)
What is the only letter of the English alphabet that does not appear in the name of any US state?
Q
Balance:
Na + O₂ → Na₂O
4Na + O₂ → 2Na₂O
What is the mass number?
number of protons + neutrons
What would be the electron configuration for an atom of Aluminium?
2,8,3
Which side of the periodic table contains non-metals?
Right side
What is the largest organ of the human body?
Skin
Why must chemical equations be balanced?
Because of the law of conservation of mass — atoms cannot be created or destroyed.
An element has an atomic number of 15 and a mass number of 31.
How many neutrons does it have?
16
What would an atom in Group 7 do to form a stable configuration?
Gain one electron
Why are elements in the same group chemically similar?
Same number of valence electrons
What is the dot above a lowercase 'i' or 'j' called?
A tittle
Balance:
Al + O₂ → Al₂O₃
4Al + 3O₂ → 2Al₂O₃
An atom of element X has 20 protons, 18 electrons and 22 neutrons.
Identify the element, and state its charge
Calcium 2+
What is the electron configuration of an Oxygen Ion (O2-)
2,8
Explain why elements get more reactive as you go down Group 1.
Outer electron is further from the nucleus → weaker attraction → easier to lose
In ten-pin bowling, what is three consecutive strikes called?
A turkey
Balance the combustion of ethanol:
C₂H₅OH + O₂ → CO₂ + H₂O
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O