Scientists & Discoveries
Which scientist's evidence measured the ratio of the masses of elements in each compound?
What is John Dalton?
Which atomic model described the atom as a solid, indivisible sphere?
What is Dalton's model?
Which subatomic particle is presented by the atomic number?
What is proton?
Which subatomic particle is located inside of the nucleus and is postively charged?
What is the number of protons?
According to Bohr's model, electrons occupy specific regions called what?
What is energy levels/orbitals/electron cloud?
Which scientist discovered evidence that atoms contain negatively charged particles by studying a glowing beam?
What is JJ Thomson?
Which atomic model is known as the "plum pudding model"?
What is Thomson's model?
Which subatomic particle has a negative charge?
What is electron?
What two particles are added together to determine an atom's mass number?
What is protons & neutrons?
What happens when an electron gains energy?
What is it moves to a higher energy level?
Which scientist detected electrons?
What is JJ Thomson?
Which model proposed that the atom is mostly empty space with a small, dense nucleus?
What is Rutherford's model?
Which subatomic particle has no charge?
What is neutron?
Atoms of the same element that have different numbers of neutrons are called what?
What is isotopes?
What happens when an electron releases energy?
What is it moves to a lower energy level?
Which scientist concluded that like charges repel and opposite charges attract?
What is JJ Thomson?
Which model proposed that electrons move around the nucleus in specific energy levels?
What is Bohr's model?
Which two subatomic particles have approximately the same mass?
What is protons & neutrons?
An atom has 13 protons and 14 neutrons. What is its mass number?
What is 27?
What is an atom called when its electrons have gained energy and moved to a higher energy level?
What is excited state?
Which scientist thought that all substances were made of 4 elements - water, earth, fire, & air?
What is Aristotle?
Which modern model describes electrons as being found in regions of probability called electron clouds?
What is electron cloud model?
What properties distinguish subatomic particles from each other?
What is mass, charge, & location?
An atom has an atomic number of 17 and a mass number of 37. How many protons, neutrons, and electrons does a neutral atom have?
What is 17 protons, 20 neutrons, & 17 electrons?
When an electron moves from a higher energy level to a lower energy level, what does it release?
What is energy?