Attraction between sea of electrons and metal cations.
200
How do you determine the atomic mass of an element?
Add the number of protons and neutrons together.
200
Why does atomic radii go down when you move across a period?
Due to increased number of protons, the attractive force between the outer shell electrons and protons is stronger, thus drawing in the electrons more and reducing the atomic radius.
200
What atoms are involved in and how many of each are in this molecular compound: dinitrogen tetroxide.
2 Nitrogen, 4 oxygen
200
What is a cation and what is an anion? Give an example of each.
Metal ion and non-metal ion OR positive ion and negative ion.
200
How are metal atoms arranged in a metallic compound?
A lattice
300
Why do noble gases not react?
They have full outer/valence shell electrons so they don't react as they are fully stable without needing to share/gain/lose electrons.
300
What do elements in the same group have in common?
Same number of valence electrons
300
How many covalent bonds can Fluorine make and why?
1 covalent bond, only has 1 valence electron to form an electron pair.
300
Compared to covalent bonding, would ionic compounds have a higher or lower boiling point? Why?
The attraction between ions in ionic compounds is stronger and thus requires more energy.
300
What property defines a metallic element?
Tendency to lose electrons/low electronegativity.
400
What defines an element?
Atoms that have the same number of protons.
400
Why does reactivity generally increase when you go down a group?
Valence electrons are further away from nucleus so they are more easily lost.
400
Draw the Lewis structure of carbon dioxide.
Double bonds between the carbon and oxygens.
400
What is the ionic formula for a compound made from iron(III) and oxygen?
Fe2O3
400
Why can metals conduct electricity?
Free flowing sea of electrons can carry charge and thus conduct electricity.
500
When atoms become ions, their electron configuration becomes the same as what group of elements?
Noble gases
500
What is the electron configuration of calcium?
2,8,8,2
500
Why do covalent compounds generally have low melting/boiling points?
Attraction between individual molecules is weaker and thus requires less energy to break those attractive forces.
500
What is the electron configuration of a potassium ion?
2,8,8
500
How does metallic bonding explain the property of malleability?
The sea of electrons keeps the metal atoms together. When a metal atom moves, the sea of electrons prevents the repulsion of like charges, thus allowing metals to be malleable.