finish sentence
Atom Labeling
random
T/F
elements
Periodic Table
Counting Atoms
100
in an atom, the number of protons equals the number of :____
electrons
100
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
proton
100
which particle of an atom has a negative charge ?
electrons
100
True or False: nonmetals can be found on the right side of the periodic table.
(if false name correct answer)
True
100
compare the properties of metals and non-metals:____
(list at least 2)
NON METALS: dull, gases at room temperature, solid non metals are usually dull and brittle
METALS: solid at room temperature, shiny, malleable, good conductors of electricity
100
The rows in the Periodic Table are called this
Periods
100
How many of each atom are there in the chemical formula: H2O
Two Hydrogen and 1 Oxygen
200
a chemical bond formed when two atoms share electrons is called:____
covalent bond
200
A subatomic particle that has no charge and that is found in the nucleus of an atom
Neutron
200
which information in the periodic table indicates the number of protons in an atom ?
atomic number
200
True or False: the horizontal row in the periodic table are known as groups.
(if false name correct answer)
False, periods
200
how do valence electrons relate to the chemical reactions of an element?
chemical reactions occur whenever valence electrons are shared or transferred between atoms. show how strong it would be.
200
The columns in the Periodic Table are called this.
Groups/Families
200
How many of each atom in the chemical formula
6NaF
6 Sodium and 6 Fluorine
300
when an atom loses an electron, it becomes a:____
positive ion
300
The number that identifies an atom of an element
Atomic Number
300
Number of protons and neutrons
Atomic Mass
300
True or False: the modern periodic table is organized according to atomic mass
(if false name correct answer)
(if false name correct answer)
False, atomic number
300
compare a covalent and an ionic bond:_____
(at least two)
COVALENT BOND: two atoms share valence electrons. neither atom loses electrons or takes electrons from the other.
IONIC BOND: one or more electrons are transferred from one atom to another. atoms that lose electrons become positively charged ions, atoms that gain are negatively charged.
300
The left side of the periodic table is filled with this type of element
Metals
300
How many of each element in Mg(NO3)2
1 Magnesium, 2 Nitrogen, 6 Oxygen
400
electrons involved in bonding between atoms are:_____
valance electrons
400
What is label C pointing at and who discovered it
The nucleus, Rutherford
400
how many sodiums are in this formula?
4Na2S
8
400
True or False: atoms with the same number of protons and different numbers of neutrons are called isotopes
(if false name correct answer)
True
400
the mass of an atom may be determined by adding the masses of the protons and neutrons in the nucleus. why is it unnecessary to include the electrons when determining the mass of an atom ?
the mass of an electron is much lower than the mass of a proton or a neutron. when adding the masses of the particles together, the mass of electrons will not add significant amount to the total mass of an atom.
400
Boron, Silicon and Polonium are all examples of this type of material and have these properties.
Metalloids. Can act as a metal and a non metal at the same time.
400
How many of each element in
7Al2(SO4)3
14 Aluminum, 21 Sulphur, 84 Oxygen
500
measurements of half life make radioactive isotopes useful for:______
determining the aging of rocks and fossils
500
The amount of valence electrons and energy levels in Silicon
4 Valence electrons, 3 electron shells
500
true or false: transition metals contain the most elements on the periodic table?
(if false name correct answer)
false, metals
500
True or False: when electrons are transferred between two atoms, a covalent bond is formed
(if false name correct answer)
False, shared
500
in an electron dot diagram of aluminum (Al), how many dots should be drawn around the elements symbol ?
3 valence electrons, elements in group 13 have 3 valence electrons.
500
In the periodic table, the most reactive metals are found:_______
name one metal:_____
group 1, the first column on the left
500
How much sodium and boron is in the formula?
2NaMg3Al6(BO3)3Si6O18(OH)4
2 Sodium, 6 Boron