Does the periodic table contain more metals, non-metals or metalloids?
metals
100
In Ancient Greece, he suggested that atoms differ in size, shape, mass and arrangement, but also understood that all matter is made up of atoms.
Who is Democritus?
100
By bombarding this with radioactive particles, Ernest Rutherford determined that atoms were mostly empty space.
What is gold foil?
100
This is the number of subatomic particles that make up an atom.
What is three (protons, neutrons and electrons)?
100
This subatomic particle is found outside the nucleus, has a mass of 0 amu, and has a negative charge.
What is the electron?
200
How many valence electrons does Argon have?
What is 8?
200
This English chemist is credited with developing the first modern atomic theory. He added on to Democritus's ideas by suggesting that atoms only combine in whole number ratios.
Who is John Dalton?
200
The atom is mostly....
What is empty space?
200
The smallest part of an element with all the properties of the element.
What is an atom?
200
Of the three main subatomic particles, these two are found inside the nucleus.
What is the proton and neutron?
300
This scientist's "plum pudding" model, where negative particles are embedded in positive matter, arose from his work with cathode ray tubes.
Who is JJ Thomson?
300
While studying radiation of the element Beryllium, this scientist identified the neutron as a particle with the same mass as a proton, but with no charge.
Who is James Chadwick?
300
After his work with cathode ray tubes, JJ Thomson suggested that negative electrons were embedded in positive matter. This is the name of his model.
What is the plum pudding model?
300
Subatomic particle with a mass of 1 amu and a charge of 0. This particle is found in the nucleus of an atom.
What is a neutron?
300
As we move across the periodic table, these two values increase by one from one element to the next.
What is atomic number and proton number?
400
This Danish physicist that determined that electrons traveled in definite orbits at specific distances around the nucleus. In addition, he suggested that electrons have different levels of energy, depending on their distance from the nucleus.
Who is Niels Bohr?
400
Which of these are not an element?
He, Iron, Magnet, O
What is magnet
400
Most of the mass of an atom is located in the ___.
What is a nucleus?
400
The atomic mass of an element is equal to the sum of these.
What is the number of protons and the number of neutrons?
400
The center of an atom.
What is the nucleus?
500
A neutral atom will have the same number of _____.
What is protons and electrons?
500
While working gold foil, this scientists discovered and named the nuclues.
Who is Ernest Rutherford?
500
In the most recent model of an atom, electrons are located in
What is an orbital?
500
The subatomic particle that is ALWAYS equal to the atomic number.
What is the number of protons?
500
Atoms in the same column have this in common.
What is group number and number of valence electrons?