C9 Flashcards
How are elements ordered in the periodic table? [1]
By increasing atomic number (number of protons)
What is the trend in metallic character across a period? [1]
A gradual change from metal to non-metal
What are the vertical columns in the periodic table called? [1]
Groups
What are the horizontal rows in the periodic table called? [1]
Periods
What happens to the number of electrons in the outer shell of an element across a period [1]
It increased
What happens to the structure of an element across a period? [1]
Giant metallic (e.g Li) - giant covalent (e.g C) - simple molecular (e.g Ne)
Why do elements in the same group react in a similar way? [1]
they have the same amount of electrons on outer shell
What is the same for elements in the same period? [1]
They have the same number of shells of electrons
what are the properties of group 1 elements (the alkali metals?) [2]
They are good conductors of hear and electricity
they are soft metals
What are the trends in group 1 as you go down the group? [3]
Reactivity increases,
Density increases,
Melting point decreases
Write the balanced symbol equation for Lithium with Oxygen [1]
4Li(s) + O₂ (g) –> 2Li₂O (s)
Write the balanced symbol equation for sodium with water [1]
2Na (s) + 2H₂O (l) –> 2NaOH (aq) + H₂
Write the balanced symbol equation for the reaction of rubidium with chlorine [1]
2Rb (s) + Cl₂ (g) –> 2RbCl (s)
Describe the appearance of the halogens chlorine, bromine and iodine [3]
Chlorine is a pale yellow-green gas,
bromine is a red-brown liquid,
iodine is a grey-black solid
the halogens are diatomic, describe what this means [1]
there are 2 atoms in the molecule (e.g Cl₂)
