Fundamentals Of Chemistry Flashcards
(48 cards)
What is the smallest unit of an element?
Atom
What is surrounded by one or more electrons in an atom?
Nucleus
What does the atomic nucleus consist of?
Contains protons and usually neutrons
What is the mass of an atomic nucleus?
Mass of 1
What charge does the proton have?
Positive charge
What charge does the neutron have?
Neutral
What is the protons and nucleus held together by?
Nuclear force
What is the overall charge of an atom?
Neutral
Why is the charge neutral?
Equal amounts of protons and electrons. The negative and positive charges came each other out
What determines different elements?
Atoms that have different protons and also electrons
What determines an isotope?
Atom has same number of protons and electrons but different number of neutrons of the same element.
Who formulated the periodic table?
Dmitri Mendeleev
What are vertical columns called on the periodic table?
Groups
What are horizontal rows called on a periodic table?
Periods
What is the top number called on an element for example..
7
Li
3
Atomic mass
What is atomic mass?
Number of protons and neutrons
What is the bottom number called on an element for example..
7
Li
3
Atomic number
What is atomic number?
Number of protons
What does number of protons in an element indicate?
Properties of an element
Where is it located in the periodic table
What is molecular mass?
Total sum of mass of individual atom
What is avgadros number?
6.02 x 10^23
What does one mole of any substance contain?
6.02 x 10^23 particles of that substance
Example: one mole of carbon will have 6.02 x 10^23 carbon atoms
How do you calculate amount of moles?
Amount of moles= amount(in grams)/molar mass
(in g/mol)
What is molar mass the same number as?
Molecular mass
