Atomic Structure Flashcards
1.14 know what is meant by the terms atom and molecule 1.15 know the structure of an atom in terms of the positions, relative masses and relative charges of sub-atomic particles 1.16 know what is meant by the terms atomic number, mass number, isotopes and relative atomic mass (Ar) 1.17 be able to calculate the relative atomic mass of an element (Ar) from isotopic abundances (17 cards)
What is the definition of a molecule?
A molecule consists of two or more atoms chemically bonded (by covalent bonds)
What is the definition of an atom?
Atoms are neutral because they have the same amount of positive protons and negative electrons.
What is the charge of an electron?
-1
What is the relative subatomic mass of an electron?
1/1836
Where are the electrons in the atom?
In the shell
What is the charge of a proton?
+1
What is the relative subatomic mass of a proton?
1
Where are the protons in an atom?
The nucleus, with the neutrons
What is the charge of a neutron?
0
What is the relative subatomic mass of a neutron?
1
Where are the neutrons in an atom?
The nucleus with the protons
There are an equal number of ______ and ______ in an atom.
protons and electrons
How do you know the atomic number?
atomic number=number of protons
How do you know the mass number?
mass number=number of protons+number of neutrons
What is the definition of an isotope?
Atoms of the same element with the same number of protons and a different number of neutrons.
What is relative atomic mass?
Average mass of an atom of an element
How do you calculate relative atomic mass?
calculate the total mass of 100 atoms and divide by 100
