Atomic structure Flashcards
What is an atom?
An atom is the smallest part of an element that can exist and still exhibit properties of the element
How can each element be represented?
By an atomic symbol which represents one atom of the element
What is the atomic number?
The number of protons in an atom is known as the atomic number with the symbol Z
How are elements arranged in the periodic table?
According to their atomic number
What is the 1st element in the P.T (periodic table) and why?
The atomic no. for hydrogen is 1, which means that hydrogen has 1 proton and is, therefore, the 1st element in the periodic table
The number of protons equals to…
The number of protons (atomic number) will be equal to the number of electrons
The atomic number is also referred to as the…
Proton number
What is the mass no. and what is the symbol?
The number of protons and neutrons is known as the mass number with the symbol A
How can you calculate the number of neutrons?
by subtracting the atomic no. (protons) from the mass number (protons + neutrons)
A (mass#) - Z (atomic/proton#)
is the mass number unique to the particular atom?
No, unlike the atomic number, it is not
eg. 2 elements can have the same mass number but 2 elements cannot have the same atomic number
How can we represent an atom (or ion) of an element?
Using nuclear notation
mass no.=
number of nucleons in a nucleus (protons+neutrons)
What is the symbol for MASS NO.
A
Atomic no.=
Number of protons (alone) in a nucleus
What is the symbol for atomic no.
Z
