Atomic Theory and Bonding

Question 1

Valency

Answer 1

the no. of bonds an element or ion. can form

Question 2

ion

Answer 2

charged particle formed by the losing or gaining of electrons

Question 3

mass no. =

Answer 3

number of protons + neutrons

Question 4

electrons have a mass of ____ and are _____ charged

Answer 4

almost 0, negatively

Question 5

neutrons mass:___ charge:___

Answer 5

m=1 c=neutral

Question 6

protons mass:__ charge: ___

Answer 6

m=1 c=+1

Question 7

isotope

Answer 7

atoms with same atomic number, different mass numbers (same no. protons, different no. neutrons)

Question 8

metal atoms ______ to form ______

Answer 8

lose electrons, positive ions

Question 9

non-metal atoms ______ to form ______

Answer 9

gain electrons, negative ions

Question 10

a bond between two non-metal elements is

Answer 10

covalent molecule OR carbon diamond, carbon graphite and silicon dioxide are covalent networks

Question 11

properties of covalent molecule

Answer 11

low mp/bp, never conduct

Question 12

properties of covalent network

Answer 12

high mp/bp, don’t conduct

Question 13

what is a bond between a metal and a non-metal called, and what are its properties

Answer 13

ionic, high mp/bp, conduct when liquid or dissolved

Question 14

what structure occurs in ionic bonding

Answer 14

ionic lattice

Question 15

what is a bond between a metal and a metal called, and what are its properties

Answer 15

metallic, high mp/bp, conducts

Question 16

why do ionic compounds not conduct when solid

Answer 16

ions are not free to move

Question 17

why do ionic compounds have high mp

Answer 17

to melt an ionic compound millions of strong ionic bonds must be broken, this requires a lot of energy

Question 18

covalent molecular substances have _______? (bonds)

Answer 18

strong covalent bonds within the molecule and weak bonds between molecules