Atomic structure Flashcards
How published his idea about atoms?
John Dalton published his idea about atoms.
What year did john Dalton share his idea about atoms?
In 1803
What did John Dalton think about atom?
He thought that all matter was made by atom.
When did Electrons got discovered?
Electrons got discovered nearly 100 year later.
Who discovered Electrons?
J J Thomas discovered electrons.
What is plum pudding model?
An early model of the atom in which an atom is a ball of positive charge with Negative electrons embedded.
Who designed an experiment to test plum pudding model?
Ernest Ruther ford designed an experiment from plum pudding model.
When Ernest Ruther ford test them?
Hi test in 1909.
What did Ernest Ruther ford find in experiment
In the experiment hi find out there is an positively charged alpha particle were find in the gold fiol.
What is Alpha particle?
Subatomic particle comprising two protons and two neutrons.
What did new atom called?
It called a nuclear model.
What is inside of nuclear?
The mass of an atom is concentrated at the centre of atom there is Nucleus, that contain protons and neutrons.
What charge does protons have?
Protons have positive charge.
What charge does neutron have?
Neutrons have no charge they are neutrol.
What charge does electrons have?
Electrons have negative charge.
What is atomic number?
The tell us how many number of protons in the nucleus of an atom. Also called the protons number.
What is Mass number?
The mass number of an atom is its total number of protons and neutrons.
What is subatomic particle?
Objects found in atoms, including protons, neutrons and electrons.
How to calculate the number of subatomic particles?
To calculate the number of subatomic number in an atom, use its atomic number and the mass:
1.Number of protons = atomic number
2.Number of electrons = atomic number
3.Number of neutrons = mass number - atomic number.
What is isotopes?
Atoms of the same elements with different numbers of neutrons are called isotopes.
What does isotopes has?
Isotopes of an elements have:
1.The same atomic number.
2.Different mass numbers.
What is relative atomic mass?
The mean relative mass of the atoms of the atoms of the different isotopes in an elements.
Who to calculate relative atomic mass?
The relative atomic mass, Ar, of an elements is calculated from:
1.The mass numbers of its isotopes.
2.The abundance of these isotopes.
What is abundance?
If there is a lot of something, it is described as being abundant.
What formula to find relative atomic mass?
Ar total mass of atoms/totals number of atoms.
