The periodic table shows the chemical elements in order of their atomic number. It also contains information about the relative masses, and the way in which electrons are arranged in different atoms.
What name is given to atoms of the same element with different numbers of neutrons?
An isotope is written as carbon-14. What does this tell you about the isotope?
Carbon-14 has 14 neutrons
Carbon-14 has a mass number of 14
Carbon-14 has an atomic number of 14
What is meant by the term 'relative atomic mass'?
The average mass of the isotopes of an element
The number of protons and neutrons in an atom
The total mass of all isotopes of an element
Neon has two common isotopes: 90% of neon atoms are neon-20 and 10% of neon atoms are neon-22. What is the relative atomic mass of neon?
What property of atoms did Mendeleev use to put together his first periodic table?
Number of electrons in outer shell
Mendeleev changed the order of some pairs of elements in his periodic table. Why did he make these changes?
To put elements with similar properties in the same column
To put atoms with similar names in the same column
To put elements in order of their atomic weight
A modern periodic table arranges atoms in rows and columns. What names are given to these rows and columns?
The rows are shells and the columns are groups
The rows are groups and the columns are periods
The rows are periods and the columns are groups
What is the maximum number of electrons that the first electron shell can hold?
What is the electron configuration of aluminium (atomic number 13)?
Rubidium is an element in group 1 of the periodic table. How many electrons are there in the outer shell of a rubidium atom?