Atomic Structure
Number of protons and electrons found in Selenium
34 for both
Two kinds of conductivity + are they physical or chemical?
physical - thermal / electrical
Cooking an egg is an example of a ..
chemical change
The name of the row and column
Period (Row) and group (column)
The reason for the Noble gases unreactive nature
They have a full valence shell
Rutherford's gold foil experiment taught us this about an atom
It's mostly made of empty space
A certain substance is flammable, is this a physical or chemical property?
Chemical
The name of a solid product formed in a reaction + indicator of chemical or physical change ?
Precipitate / chemical
The element in period 5, group 8
Ruthenium
The elements that are on "the stair case" seperating metals from non-metals
metalloids
Subatomic particles
Protons, neutrons, electrons
Silver is shiny - identify the property and state whether it's a physical or chemical property
Luster - Physical
Water boils to become steam - chemical or physical change?
physical - change of state
The number of energy shells found in: Bromine
4
The Bohr diagram + Lewis structure for Sulfur
Checked by teacher
Number of neutrons in Nickel
31
Is density a physical or chemical property and what unit is it measured in?
physical - g/mL or kg/L
When an acid and base reaction it is a ________ change and this reaction is called a _________
chemical / neutralization
The number of valence electrons in strontium
2
Number of elements and atoms in: Ca3(PO4)2
Ca x 3, P x 2, O x 8 = 13 atoms total
Main difference between J.J Thompson and Bohr's atomic model
Bohr said electrons are orbiting the nucleus - Thompson said electrons are stuck to the positive charge
A metal can be stretched into wires - the name of this property and is it physical or chemical?
ductility - physical
An acronym to remember indicators of chemical change + what they stand for
AGAPE- aroma, gas, altered molecules, precipitate, energy change
An element that has a charge of 3- when ionizing (two possible answers)
nitrogen, phosphorus
The movement of electrons when a halogen + alkali metals form a bond
alkali metal loses ONE electron to the halogen - ionic bond