Atoms
Which particles are found in the nucleus?
protons and neutrons
The symbol for H represents which element?
hydrogen
Why did Mendeleev leave gaps on the periodic table?
Mendeleev left gaps in the periodic table for elements that he thought had not yet been discovered.
What is the chemical name of this compound?
O2
oxygen
Give 3 properties of metals.
the charge of a proton is ________ and the charge of a neutron is _________.
positive (+) ; neutral
The symbol for He represents which element?
helium
True or false: an ion is an atom with an electromagnetic charge.
TRUE
What is the common name of this compound?
H2O
water (dihydrogen oxide)
Give 3 properites of non-metals.
brittle, dull, low density, poor conductors of heat and electricity
the particle with an atomic mass of 0 and negative(-) charge.
electron
The symbol Fe represent which elements?
Iron
True or false: a negative ion has lost an electron.
FALSE. A negative ion has GAINED an electron, making it have MORE electrons than protons.
electrons > protons = NEGATIVE CHARGE
electrons < protons = POSITIVE CHARGE
What is the chemical name of this compound?
CO2
carbon dioxide
Which group on the periodic table is considered inert?
noble gases
True or false: The atomic number is the total mass of protons + neutrons.
False; the atomic number is JUST the number of protons. The atomic mass number is the mass of protons + neutrons.
The symbol for Na represents which element?
sodium
Explain how the atomic radius changes (decreases or increases) going:
1. across a period (left to right)
2. down a group.
atomic radius DECREASES across a period (left to right) and INCREASES going down a group
What is the chemical AND the common name of this compound?
NaCl
sodium chloride; table salt!!!!
Which group on the periodic table desperately wants to LOSE an electron to complete their outermost shell?
alkali metals
True or false: Isotopes are atoms of the same element with a different number of neutrons, but the same number of protons.
true
The symbol N represents which element?
nitrogen
What is ionization energy?
the energy required to remove an electron from the outermost shell of the atom (thus, making it an ion)
What is the difference between a mixture and a compound?
compound: 2 or more substances CHEMICALLY BONDED TOGETHER
mixture: 2 or more substances NOT chemically bonded together
which group on the periodic table desperately wants to GAIN an electron to complete their outermost shell?
halogens