The basics

• Ammonia = NH3

  Hydrogen = H2

  Chlorine = Cl2

  Oxygen = O2

  Ammonium = NH4+

  Hydroxide = OH-

  Nitrate = NO3-

  Carbonate = (CO3)2-

  Sulfate = (SO4) 2-
• hazard symbol

  1. cause skin irritation
  2. cause difficulties in breathing
  3. cause death if swallowed or inhaled
  4. damage skin and clothing
  5. catch fire easily
  6. make flammable substance burn violently
  7. cause damage to animal and plant life

  A) moderate health hazard

  B) serious health hazard

  C) toxic

  D) corrosive

  E) flammable

  F) oxidising

  G) environmental hazard

  
• Name all the component in an atom

  Atomic structure

  A) Proton

  B) Neutron

  C) electron

  D) nucleus

  
• What is the radius of an atom

  10^(-10) m
• Nuclear symbols

  Nuclear symbols

  A) mass

  B) Atomic number

  C) Element

  
• Elements

  Substance made up of atoms with the same number of protons
• Why does each element have a unique atomic number?

  Because different element have different number of protons
• Isotopes

  Atoms of the same number of protons but different number of neutrons
• Relative atomic mass

  the average mass of atoms of an element relative to the mass of an atom of carbon-12
• Equation for relative atomic mass

  Ar = sum of different ((percentage of abundance) x ( mass number ))/ (total abundance )
• How does Mendeleev make his periodic table?

  • by atomic mass
  • so element with similar chemical properties formed columns
• What are some prediction or mistake Mendeleev made in his arrangement ?

  • swap some element round in place where ordering stomic mass didn't fir in pattern
  • left gaps in the table to keep element with similar properties together
  • Some of the atomic mass he used were wrong due to the pressence of isotope
  • predict the properties of missing element in the columns
• How does the modern perodic table organised the element?

  • by increasing atomic number
  • horizontal rows are periods
  • vertical rows are groups
  • elements with similar properties are in a group

  
• Electron configuration

  • group number = number of electron in the outer shell
  • period number = number of shells
• Where does the of metal and non- metals in a periodic table start from?

  staircase

  A) boron

  B) silicon

  
• Where does the gas starts from?

  Gun shape

  A) nitrogen

  B) oxygen

  C) chlorine