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Ionic and covalent bonds (3o ESO with Alicia)
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What is the name of group 17 of the periodic table?
Halogens
What is the name of group 1 of the periodic table?
Alkali Metals
What is the name of group 18 of the periodic table?
Noble Gases
What is a chemical compound?
A substance formed by 2 or more atoms chemically joined together
Why do atoms form compounds?
To become stable by gaining, loosing or sharing electrons
Are all atoms stable?
No, most atoms are UNSTABLE
Which atoms are stable? Why?
The Noble Gases (group 18) because they have a FULL valence shell.
Which group/family of elements is the most REACTIVE?
Group 17; they only need 1 electron to become stable
When a neutral atoms gains 1 electron, it becomes a POSITIVE/NEGATIVE ion?
negative
When a neutral atoms gains 1 electron, it becomes a NEGATIVE ion. WHY?
Because now it has more electrons that protons
What are the 3 types of chemical bonds?
Ionic bonds, covalent bonds and metallic bonds
Covalent bonds happen between METAL/NON-METAL and METAL/NON-METAL elements.
non-metal and non-metal elements
In covalent bonds, atoms GAIN/LOSE/SHARE electrons.
share
Can covalent bonds form between 2 atoms of the SAME element?
Yes, for example CL-CL
In covalent bonds, atoms share electrons from WHICH shell?
valence shell or the outer shell
In covalent bonds atoms share electrons. To do this, atoms ________ (verb) their valence shells.
overlap
Nitrogen is in group 15. How many covalent bonds can it form?
up to 3
In ionic bonds, atoms GAIN/LOSE/SHARE electrons?
gain and lose
Ionic bonds happen betweem METAL/NON-METAL and METAL/NON-METAL elements.
metal and non-metal
An ionic bond is formed because of _________ attraction between an anion and a cation.
ELECTRICAL attraction
The bond between atoms in an ionic bond is very WEAK/STRONG.
very STRONG
What type of bond will form between Na and F?
ionic
What type of bond will form between N and O?
covalent
What type of bond will form between Br and I?
covalent
What type of bond will form between Mg and O?
ionic
Why do ionic bonds have high melting and boiling points?
Because these is a strong bond between their ions
What do we call this compound? KF
potassium flouride
What do we call this compound? CaS
calcium sulphide