Grade 9 - Periodic Table Flashcards
What is the Atomic Number?
The Atomic Number is the number of protons the element has. This number is typically the whole number that is basically just the regular number of the element, e.g Hydrogen is 1, Oxygen is 8. It can also mean the number of Electrons, unless the atom is an ion
What is the group number on the periodic table?
The number of electrons in the outer shell. The group numbers are the columns. Elements in the same group have similar properties, e.g all the alkali metals have the same properties.
The electrons in the outer shell are called valence electrons btw
What is the period number on the periodic table?
The number of shells an element has. The period numbers are the rows.
What is Group 18(or Group 8) on the periodic table?
Noble Gases. They are very unreactive because they have full outer shells
What is Group 1 on the Periodic Table?
Alkali Metals. They are very reactive because they only have 1 valence electron (electron in the outer shell).
What are some examples of Noble Gases?
Just name 2 or 3, thats enough
- Helium
- Argon
- Krypton
- Xenon
- Radon
- Oganesson
Why are Alkali Metals so reactive?
They only have 1 electron in their outer shell, which is very easily taken away, meaning they’re more reactive.
Also the further down the periodic table you go the more reactive they get. If you want an explanation as to why this is, ask me in school or look it up idc
What are some examples of alkali metals?
You dont need to name them all, like 2 or 3 is good
- Lithium
- Sodium
- Potassium
- Rubidium
- Caesium
- Francium
1
1This one is so reactive that it can only be used in military stuff :(
What is Group 17 (Or group 7) on the periodic table
Halogens. They are all toxic and reactive, and they all have 7 electrons in their outer shell.
Unlike the Alkali Metals, Halogens get less reactive the further down you the periodic table you go. Once again, if you want an explanation, ask me in school or look it up
What are some examples of Halogens?
Once again you don’t need to name them all, 2 or 3 is good
- Fluorine
- Chlorine
- Bromine
- Iodine
- Astatine
- Tennessine
What are Transition Metals?
Transition metals are the large block of elements in the middle of the periodic table. They include the basic well known metals such as Iron, Gold, Silver etc. They tend to Hard, have high melting and boiling points1, and are good conductors of heat and electricity
1Mercury is an exception to this, as it is liquid and has a low melting point
What are alloys?
Alloys are a mixture of a metal with another substance, and they tend to be stronger, harder, and have other improved properties. For example, Stainless Steel is a an alloy that rusts a lot less than just Iron on its own
What are some examples of alloys?
- Stainless Steel - Iron + Chromium + Nickel
- Not-Stainless Steel (Just call it Steel) - Iron + Carbon
- Bronze - Copper + Tin
- Brass - Copper + Zinc
Where is the divide between Metals and Non-Metals?
The divide is a sort of staircase down, that you can probably see on the periodic table that you definitely have somewhere
