Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
What is the periodic table?
|
The periodic table of the elements developed as an attempt to classify the elements. It arranges them in a pattern according to their properties
|
|
|
What was a major problem with some of the early periodic tables?
|
Early versions failed to take into account of the fact that not all of the elements were known at that time
|
|
|
Who was the key man who revolutionised the periodic table?
|
Dmitri Mendeleev. It took account of unknown elements and provided the basis for the modern periodic table.
|
|
|
How is an elements place in the periodic table determined?
|
By its atomic (proton) number
|
|
|
What determines the chemical properties of an atom?
|
The number of electrons in the highest energy level. E.G. If the arrangement is 2,8,8,2. It is in group 2 (last number). If its arrangement is 2,8,8,7 it is in group 7
|
|
|
How can we explain trend in reactivity as we go down a group?
|
Because of the number of energy levels in the atoms
|
|
|
What are the elements in group 1 of the periodic table called?
|
The alkali metals
|
|
|
When alkali metals react with water they produce ________ and _______
|
Hydrogen and an alkaline solution containing the metal hydroxide
|
|
|
The reactivity of the alkali metals increases/decreases as we go down the group
|
increases
|
|
|
What kind of molecules are the halogens?
|
diatomic (e.g. They always have a little two after their element. E.g. Cl2, Br2, I2)
|
|
|
When halogens form ions, what is their charge?
|
A single negative charge. Because they gain an electron. So the ion for Cl2 would be Cl- (sorry I can't do subscript and superscript)
|
|
|
What kind of compounds do the halogens form?
|
COVALENT compounds. They share electrons with other non-metals.
|
|
|
The reactivity of the halogens increases/decreases as you go down the group
|
decreases
|
|
|
What kind of melting points/density do the transition elements have?
|
High MP and high density.
|
|
|
What can you say about the conduction of heat an electricity in the transition metals?
|
They are very good conductors of them
|
|
|
Do the transition metals react vigorously with oxygen or water?
|
No. That's the alkali metals :)
|
