Atomic Structure
This subatomic particle has a negative charge and moves around the nucleus.
What is an electron?
Convert 5,400 into scientific notation.
What is 5.4×103?
Melting ice into liquid water is an example of this type of change.
What is a physical change?
This scientist discovered the electron using a cathode ray tube.
Who is J. J. Thomson?
This number tells how many protons are in an atom.
What is the atomic number?
This particle has nearly the same mass as a proton but carries no charge.
What is a neutron?
Convert 8.1×104 into standard notation.
What is 81,000?
Density is an example of this type of property because it does not depend on sample size.
What is an intensive property?
This experiment showed that atoms have a small dense nucleus.
What is the gold foil experiment?
An element with 17 protons belongs to this element on the periodic table.
What is chlorine?
The number of these particles determines what element an atom is.
What are protons?
A value that describes how close a measurement is to the true value.
What is accuracy?
Mass is an example of this type of property because it depends on the amount of matter present.
What is an extensive property?
In Rutherford’s experiment, most alpha particles passed straight through the foil. This suggested atoms are mostly this.
What is empty space?
If an atom has 12 protons and 12 electrons, the element is this.
What is magnesium?
The total number of protons and neutrons in an atom is called this.
What is the mass number?
How many significant figures are in 0.00450?
What is 3?
Rust forming on iron is what type of change?
What is a chemical change?
The atomic model proposed by Thomson where electrons were embedded in positive charge.
What is the plum pudding model?
An atom has 19 protons and 20 neutrons. What is its mass number?
What is 39?
Atoms of the same element that have different numbers of neutrons are called these.
What are isotopes?
A student measures 90 g when the true value is 100 g. Calculate the percent error.
What is 10%?
Name one sign that a chemical change has occurred.
Possible responses: gas formation, color change, temperature change, precipitate formation.
The part of the atom responsible for deflecting alpha particles in Rutherford’s experiment.
What is the nucleus?
Write the nuclear symbol for carbon with mass number 14.
146C