If an atom has 12 protons and 15 neutrons, what is its isotope name?
Magnesium - 27
100
How many valence electrons does lithium have?
1
100
What do Carbon-12 and Carbon- 13 have in common?
Same number of protons (atomic number)..
100
What is the charge of a proton?
Positive
200
Where are protons located?
The nucleus
200
If an element has 20 protons, 20 electrons, and 20 neutrons, What is its ATOMIC NUMBER?
20
Atomic Number = Number of Protons
200
What is the charge of Aluminum when he becomes an ion?
Al +3
200
From its name, what do you know about Oxygen-22?
(What does 22 stand for?)
Its mass number is 22.
200
What is the charge of a neutron?
Neutral / No charge
300
What are electrons located?
Electron Cloud
300
An atoms Mass Number is 30.... Keeping in mind that the atomic number is 17, what can you tell about the atom?
((Hint: How do you find the number of neutrons?))
It has 13 neutrons..
mass number - atomic number = neutrons
30 - 17= 13
300
Does oxygen give or take electrons when he becomes an ion?
Take
300
Describe the relationship between protons and the atomic number.
They are the same numbers
300
What is the charge of an electron, and where are they located?
Negative charge, located in the electron cloud
400
Where are neutrons located?
In the nucleus
400
Neutral atoms always have an equal number of what two subatomic particles?
protons and electrons
400
The period number on the Periodic table (1-7) tells us how many _______ an atom has
Orbital Shells
400
If you know the atomic number and the mass number of an isotope, how can you find out the number of NEUTRONS?
Mass # - Atomic # = neutrons
400
why aren't electrons used to figure out the mass number of an atom?
Because electrons are too too small, they barley have any mass!
500
Protons + Neutrons = ____________
Protons + Neutrons = the mass number of an atom
500
Which about isotopes is true?
a. they have the same number of neutrons
b. they have a different atomic number
c. they have the same number of protons
C. They have the same number of protons
500
The group tells us how many ________ an atom has.
Valence (Outer) Electrons
500
To change Li to Li+, you need to:
remove one electron
500
How can you find the number of neutrons of an atom?