× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
r
4
Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
New Topic  
Fipas Fipas
wrote...
Posts: 55
Rep: 0 0
11 years ago
Also what is atomic radius?
I have also got to explain why there is 'this' pattern in melting points?
Anyone help me at all? I'm a bit confused
Read 292 times
2 Replies

Related Topics

Replies
wrote...
#1
11 years ago
atomic radius is the mean distance between the nucleus and the outermost electron cloud.
in the periodic table,it is observed that as the atomic radii increases, the melting point decreases.
in a group, the melting point increases as we proceed downwards.this is becoz the valence electrons are present far away from the electrons and hence requires less energy to breakup the lattice.
in a period a we go from left to right the atomic radius decreases and hence the MP increases
wrote...
#2
11 years ago
Basically you are talking about mp of metals in general.
Note the weaker the metallic forces the more are the delocallised (free) sea of electrons extended through the ionic lattice. Hence, less will be the mp of metals. The larger the ionic radius means lesser force between free electrons and nucleus. Hence, larger the atomic radius lesser the mp. eg mp of Na is less than Al.
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1020 People Browsing
 108 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 302
  
 809
  
 1423
Your Opinion
Which country would you like to visit for its food?
Votes: 204
Previous poll results: Which industry do you think artificial intelligence (AI) will impact the most?