Chemistry C1 The Atom Flashcards
Atom?
Smallest part of an element that can exist
What is Dalton’s mode of the atom?
Atoms as solid spheres that could not be divided into smaller parts
What is the plum pudding model of the atom?
Sphere of positive charge with negative electrons embedded in it
What did scientists 🧑🔬 discover in the alpha scattering experiment 🔬?
Some alpha particles were deflected by the gold foil-this showed that an atom’s mass and positive charge must be concentrated in one small place (nucleus )
Describe the nuclear model of the atom
A dense nucleus with electrons orbiting it
What did Niels Bohr discover?
Electrons orbit in fixed 🔧 🔧 energy 🔋 level (shells)🐌
What did James Chadwick discover?
An uncharged particle called the neutron
Where r protons and neutrons?
In the nucleus
What is the relative charge of each sub-atomic particle?
Proton:+1
Neutron:0
Electron:-1
What is the relative mass of each sub-atomic particle?
Proton: 1
Neutron: 1
Electron: 0(very small)
How can u find out the number of protons in an atom?
The atomic number on the periodic table.
How can u calculate 📏 the number of neutrons in an atom?
Mass number - Atomic number= neutrons
Y do atoms have no overall charge?
It has equal numbers of positive protons and negative electrons
How many electrons would u place in the first, second and third shells 🐌 ?
Up to 2 in the first shell 🐌 and up to 8 In each of the second and third shells 🐌
Element?
A substance made of one type of atom
