3-1
A substance that can't be chemically broken down into simpler substances is called:
What is an element?
This man was the first person to mention matter is made of atoms.(Hint:long ago)
Who is Democritus?
The center or core of an atom is called this.
What is the nucleus?
This man said the atom is mostly empty space.
Who is Ernest Rutherford?
This scientist studied radioactive elements and received two Nobel Prizes in science.
Who is Marie Curie?
At room temperature this metal is a liquid.
What is mercury?
His theory about atoms has four parts.
Who is John Dalton?
This person said electrons orbit like planets orbiting the sun.
Who is Niels Bohr?
The first scientist to suggest atoms were made of smaller particles, both positively and negatively charged that are scattered throughout was called this.
What is J.J Thomson?
This person lived over 2400 years ago and didn't know what atoms looked like, thought they were infinite in number, and could join together.
Who is Democritus?
Most of the following are elements except these two.
Gold, Mercury,Water, Silver, Iron, Sugar
What are sugar and water?
The word atom means this.
What is cannot be divided?
What charge do neutrons have and where are they located?
What is no charge and in the nucleus of the atom?
In the modern model of an atom, many scientists' work was considered. This model says electrons and energy levels are used to predict the location of electrons that are found in this:
What is an electron cloud?
This person gave us the atomic theory of matter.
Who is John Dalton?
Most of the known elements are this at room temperature.
What is solid?
Provide two parts of the modern atomic theory.
What is: 1.)All elements are composed of atoms that can't be divided or destroyed.
2.)Atoms of the same element are alike.
3.)Atoms of different elements are different.
4.)Atoms of 2 or more elements can join to form types of matter called compounds,
A positively charged particle in an atom is called this and found in the nucleus.
What is a proton?
This is the charge of an electron.
What is a negative charge?
This person's model of an atom looked like a rubber ball and had protons and electrons scattered evenly throughout the atom model.
Who is J.J. Thomson?
All matter is made up of elements or this.
What are combinations of elements?
This term is the smallest part of an element that can be identified as that element.
What is an atom?
These are negatively charged and are outside this part of the atom.
What are electrons outside the nucleus?
These are said to move in energy levels somewhere in the electron cloud.
What are electrons?
This scientist said that electrons were found at a certain distance from the nucleus in different energy levels or orbits like our planets.
Who is Niels Bohr?