Electrons
Where can electrons be found?
In the electron cloud (orbits)
Where can protons be found?
The nucleus
Where can neutrons be found?
The nucleus
How many milliliters are in 1 Liter?
1,000
How many sig figs are in the following number:
0.00205 g
3 sig figs
What is the charge of an electron?
BONUS (100 pts): How can you tell how many electrons an element has?
Negative
BONUS (100 pts): If it is neutral, it will be the same as the atomic number - If it has a charge, you count how many electrons were gained/lost from the atomic number (Charge = # P - # E)
What is the charge of a proton?
Positive
What is the charge of a neutron?
How many kilograms are in 1 gram?
0.001
How many sig figs are in the following number?
25,000
2 sig figs
What is the mass of an electron?
0 amu's
What is the mass of a proton?
1 amu
What is the mass of a neutron?
BONUS (100 pts): How can you tell how many neutrons an element has?
1 amu
BONUS (100 pts): You take the mass of the element - the atomic number
(Mass = # P + # N)
What is the following number in scientific notation:
23,500,000
2.35 x 107
How many sig figs are in the following number?
14.0500
6 sig figs
If an atoms gains or loses electrons, what will it become?
BONUS (100 pts) What is it called if it is positive/negative?
An ion
BONUS (100 pts)
Positive - Cation, Negative - Anion
What is the purpose of a proton?
BONUS (100 pts): How can you tell how many protons an element has?
It is the key identifier of the atom.
BONUS (100 pts): It is the same as the atomic number on the periodic table
What is the purpose of a neutron?
It is the buffer between positively charged protons in the nucleus.
(It is the glue that holds the nucleus together)
What is the following number in scientific notation?
0.0000789
7.89 x 10-5
What is the rule for sig figs when you are adding or subtracting?
Your answer should have the same amount of decimal places as the LEAST amount you started with.
What is the purpose of an electron?
They are the part of the atom that interacts with others (making bonds, etc) resulting in chemical reactions.
If an atom gains or loses a proton, what is it called?
BONUS (100 pts) Why is this uncommon?
A different element, the atomic number would change.
The nuclear force is extremely strong, it would result in a nuclear reaction.
If an atom gains or loses neutrons, what will it become?
BONUS (100 pts) Why is this uncommon?
An isotope, it will have a different mass.
BONUS (100 pts) it is a form of nuclear radiation (decay)
What is the smallest unit of matter?
An atom
What is the rule for sig figs when you are multiplying or dividing?
Your answer should have the same amount of sig figs as the LEAST amount you started with.