Atoms
Smallest particle of and element that still retains the properties of that element
Atom
All matter can be divided into two types of substances. What are they?
Pure substances or Mixtures
How are elements on the Periodic Table arranged?
By increasing atomic number
What is the most reactive Group of elements?
Group 1 Alkali Metals
Small number to the lower right of an element symbol
Subscript
What 3 subatomic particles are in an atom?
proton, neutron, electron
Give an example of a pure substance
Element, Compound
What are the vertical columns called and how many are there?
Groups/Families - 18
What is the most reactive group of NONMETALS and with which Group do they readily react?
Halogens - React with Group 1 Alkali Metals
Large number in front of a molecular formula
Coefficient
What are the charges for each subatomic particle?
Proton positive, Electron negative, Neutron neutral
Homogeneous, Heterogeneous
What are the horizontal rows called and how many?
Periods - 7
How does reactivity change as you move DOWN Group 1?
Becomes MORE reactive
State the Law of Conservation of Matter
In a closed system, the mass of the reactants must equal the mass of the products
Which two particles make up the mass of the nucleus?
Protons and neutrons
Name an element
Answers will vary
Which element has 3 energy levels and 1 valence electron?
Na (Sodium)
How does reactivity change in metals as you move ACROSS a PERIOD from left to right?
Metals become LESS reactive as you move from left to right across a period.
Group 1 > Group 2> Transition Metals > Poor Metals > Metalloids
How many elements are in Al2SO4?
How many atoms?
3 elements (Al, S, O)
7 atoms
What determines the atomic number?
The number of protons
Give an example of a compound
Answers will vary glucose, water, table salt
Name 3 properties of metals and 3 properties of nonmetals
Answers will vary; Metals are ductile, malleable, shiny and good conductors, Nonmetals are brittle, dull, poor conductors of heat and electricity
What is responsible for the reactivity of elements?
Valence electrons
Is the following equation balanced? Show tally on dry-erase board.
C3H8 + 5O2 → 3CO2 + 4H2O.
Yes.
3 Carbon, 8 Hydrogen, and 10 Oxygen