Chemistry
The maximum number of electrons in the first energy shell
2
What is the element symbol for Flourine?
F
Temperature of ice?
zero degrees
if the enthalpy is negative the type of reaction is an e............ reaction
exothermic
The sum of protons and neutrons in the nucleus of an atom is known as the _________
mass number
The number from the periodic table you use to find the number of electrons in a neutral atom.
atomic number
4 states of matter
Aqueous, Solid, liquid, and Gas
What is the element symbol for Calcium?
Ca
Baking the ingredients for a cake results in what kind of change?
chemical change
the atomic number of selenium
34
The atomic number tells us this.
number of protons
atoms of similar mass number but different atomic number are called?
isotopes
Water is made of these two elements.
What is hydrogen and oxygen?
The number of electrons transferred from magnesium to 1 chlorine atom.
1 only to EACH chlorine atom.
How many moles in 23 grams of nitrogen?
1.64 moles
name for Group 18 elements on the righthand side of the periodic table of elements.
What are the Noble Gases?
electrons are distributed from biggest to smallest into?orbitals, main energy levels, sub-shells.
main energy levels, sub-shells, orbitals
Two different elements that have bonded. they form a
compound
Alkaline metals belongs to this group
Group 2
Name all 3 subatomic particles.
What are Protons, Neutrons, and Electrons
What is another name for a positive ion when it loses electrons?
cation
Making ice cubes from water is what kind of change?
physical change
Valence electrons are located in this shell
outermost shell
Group or family 17 elements are these.
What are Halogens?
Elements that are the most abundant on the periodic table.
metals
A covalent bond is formed by the what of electrons?
Sharing of electrons
ionization energy decreases in what direction in the periodic table?
down a group!
how does atomic radius decreases from ____ to ____ across a period.
left to right.
Finish the sentence:
Energy is neither ..... nor ...... it is simply converted from one form -- ------
created
destroyed
to another.
Lithium, sodium, potassium, rubidium, caesium and francium belong to the family of _______ metals
Alkali metals.
How many molecules in 34 grams of carbon?
1.70 x 10^23 carbon atoms
Will sodium react with AgCl(s)?
No! Because when the precipitate is formed, it is incredibly hard to break. It is in a different phase as solid to the aqueous phase!
Covalent bonding happens generally between these type of elements.
non-metals
This refers to sets of eight.
octet rule
Molecular protective gaseous layer is found in the stratosphere. What is its name?
Ozone