The Perodic Table Flashcards
How is the modern periodic table ordered?
By atomic number
How were the early lists of elements ordered?
By atomic mass
Why did Mendeleev swap the orders of some elements
To group them by their chemical properties
Why did Mendeleev leave gapes in his periodic table
Leave room for elements that had no it been discovered
Why do elements in a group have similar chemical properties
Same number of electrons
We’re are metals and non metals located
Metals left non right
What name is given To them group 1 elements
Alkali metals
Y are alkali metals called this
They are metals that react with water to form an alkali
Give the general equations for the reactions of alkali metals with oxygen ,chlorine and water
Metal +oxegyn= metal oxide. Metal+chlorine=metal chloride. Metal+water=metal hydroxide +hydrogen
How does the reactivity of the alkali metals change down the group
Icreases (more reactive )
Why does the reactivity of the alkali metals increase down the group
they are larger atoms, so the outermost electron is further from the nucleus, meaning there are weaker electrostatic forces of attraction and more shielding between the nucleus and outer electron, and it is easier to lose the electron
What name is given to the group 7 elements
Halogens
What name is given to the group 7 elements
Halogens
The melting points of the halogens change down the group
Increase (higher melting point)
Why does the reactivity of the halogens decrease down the group
they are larger atoms, so the outermost shell is further from the nucleus, meaning there are weaker electrostatic forces of attraction and more shielding between the nucleus and outer shell, and it is harder to gain an electron
