Slide 1 : Welcome to my class…………..
Slide 2 : Enter into the world of atom
Slide 3 : An atom consists of a
nucleus
(of protons and neutrons)
electrons in space about the nucleus. The Atom
Slide 4 :
Slide 5 : A brief summary………..
Atomic number === No. of protons or electrons
Atomic mass === No. of protons + neutrons
Hence,…….
No. of protons == Atomic no.
No. of electrons == Atomic no.
No. of neutrons == Atomic mass – Atomic no.
Slide 6 : What are Isotopes?
Slide 7 : What are “ISOTOPES?” Atoms of a given element which have the same atomic number , but different atomic mass are termed-ISOTOPES LOOK AT THIS EXAMPLE-------------------? C- stands for carbon
These are two types of atoms of carbon
Ist carbon’s ato.no.= ------ & ato.mass = -------
-
2nd carbon’s ato.no.=------ & ato.mass = -------
Slide 8 : I have 3white&3 red eggs I have 3white&4 red eggs IF WHITE EGGS = NO. OF PROTONS & RED EGGS= NO. OF NEUTRONS I’M ATOM NO. 1 I’M ATOM NO.2 HERE NO. OF PROTONS ARE SAME BUT NO. OF NEUTRONS ARE DIFFERENT
Slide 9 : What is atomic number? It is the number of protons /electrons present in an atom What is atomic mass? It is the number of protons +neutrons present in an atom ATOMIC NUMBER=
ATOMIC MASS =
Two isotopes of sodium. : Two isotopes of sodium.
Isotopes of Boron : Isotopes of Boron Atoms of the same element having same atomic number but different mass number .
Boron-10 (10B) has 5 p and 5 n
Boron-11 (11B) has 5 p and 6 n
Slide 12 : SIMILAR EXAMPLES------ Isotopes of hydrogen--- Protium Deuterium Tritium 1 electron
1proton 1electron
1proton
1neutron 1electron
1proton
2neutrons
Isobars : Isobars Atoms of the same element having different atomic number but same atomic mass number . ARGON 18 Ar 40 CALCIUM 20Ca 40 Atomic number ===
Atomic mass No. ===
Slide 14 : Today I got 2 eclairs and 3 bubble gums But I got 3 eclairs and 2 bubblegums If eclairs= PROTONS & bubblegums= neutrons, Atom no 1 Atom no 2 PROTONS = -------
NEUTRONS= ------ PROTONS= ------
NEUTRONS=----- (same/different) Here no. of protons=----------
And no. of neutrons+protons= --- ------
Slide 15 : LOOK AT THESE ------
HOW TO REPRESENT ATOMIC NO. & ATOMIC MASS
IN THE SYMBOL OF AN ELEMENT
Slide 16 : 26Fe58 Atomic no mass no. P N E ----- ---- --- --- --- 27Ni58 ----- ---- --- --- ---
Slide 17 : Let’s go through the main contents of this class!
What are Isotopes?
Elements having the same atomic number but with different mass number are called Isotopes.
What are Isobars?
Elements having the same mass number but
With different atomic number are called Isobars.
Slide 18 :