Scientists and their Discoveries 1
This scientist suggested that matter existed in the form of very small, indivisible particles called "atomos".
Democritus
This scientist first suggested that elements are made of atoms and that the atoms of an element are all alike
John Dalton
These are the three subatomic particles
Protons, electrons, neutrons
Sodium (Na) has lost an electron. How would we write this as a symbol?
Na+
The law of electrostatic charges states that _____ charges attract each other, while _____ charges repel each other.
Opposite; Like
This is the scientist that discovered the electron, as well as creating the plum pudding model
J.J. Thompson
This scientist developed the Saturnian model
Hantaro Nagoaka
An element that has lost electrons is _____ charged while an element that has gained electrons is _____ charged
Positively, Negatively
A Chromium atom has 24 protons, 28 neutrons, and 24 electrons. Its atomic number would be __ and its mass number would be __
24; 52
This is why the Bohr model is still used even though it's not the most workable model
It is the easiest to understand (shows how energy levels work and how bonding works)
This scientist believed that electrons moved in spherical regions at a fixed distance from the nucleus
Niels Bohr
This scientist developed the nuclear model
Ernest Rutherford
An element that has a different number of electrons that normal is called this
Ion
One isotope of phosphorus has 15 protons and 18 neutrons. This is what we would name the isotope _____
Phosphorus-33
Double up
This model is the most widely used by scientists today
Quantum Mechanical Model
In the plum pudding model, inside the atom there are _______ ________within a positive substance
Negative Electrons
These are how the movements in the bohr model are described
Circular Movements around the nucleus
Double up
An element that has gained electrons is called this
Anion
An oxygen ion is found to be O2-. This means that the ion has _____ two electrons and has a _____ _ charge
Gained, Negative 2
Potassium-39 and Potassium-41 will always have the same amount of _______
Protons
These are how the movements of the elections in the quantum-mechanical model are described
Orbitals that are not uniform in size
Experiments involving _____ _________ led to the discovery of the nucleus
Alpha Particles
An element that has lost electrons is called this
Cation
This would be the number of protons, neutrons, and electrons in a neutral copper isotope of 65/29 Cu
Protons: 29 Neutrons: 36 Electrons: 29
Boron has two stable isotopes: Boron-10 and Boron-11. Its atomic mass is 10.81 u. Which isotope would be more common?
Boron-11