Atoms And The Periodic Table Flashcards
What is held in the nucleus of the atom
Neutrons and protons
In comparison, how many protons and how many electrons are there in a atom
The same amount
What is the atomic number
The atomic number tells you the amount of protons and electrons
What does the mass number tell you
It tells you how many protons and neutrons combined
In the early 1800s how were the elements arranged
They were arranged in order of atomic mass
How do you work out the number of neutrons in a atom
You minus the atomic number from the relative atomic mass
When the first table was introduced why were some elements placed in the incorrect group
This was because they only ordered it due to the atomic mass and did not take into account the physical properties
Why did Mendeleev leave gaps in his periodic table in 1869
He did this because he realised that whilst he mostly ordered it in atomic mass he also used the properties of the elements to help him order it. The main reason was so that the elements with similar properties were put into the same group, so gaps had to be left as there was no known elements with the correct properties
On which sides of the periodic table are metals and non metals found
The non metals are found on the right, and metals are found on the left of the periodic table
What is the vertical column with elements with the same properties is more commonly known as a what
They are known as groups
What does the group number tell you
The amount of electrons an element has in its outer shell
How does reactivity compare as you go down group one
The further you go down group one, the more vigorous the reactions become
What happens to the reactivity as you go down group 7
As you go down they become less and less reactive
What are the rows called and what do they represent
The row are called periods and they represent another full shell of electrons
What is an isotope
It is the same element as it has the same number of protons however it has different numbers of neutrons
