Question

part b.
1.draw the bohr - rutherford model of atomic structure for element beryllium. (2marks)

1. draw the lewis diagram for calcium ion. (3marks)

applications /10
part c. using bohr - rutherford model or lewis diagram of atomic structure, show the formation of the bond(s) between mg and o. what is the formula for the compound? what is the name of the compound?
part d. complete the charts below.
thinking /10
chemical name chemical formula
1.copper(ii) nitride
2.aluminum acetate
3.sodium chlorite
4.nickel(ii) oxide
5.ammonium hydroxide
chemical formula chemical name

1. be(no₃)₂

2.pbo
3.fes
4.hgcl

1. srso₃

Explanation:

Answer:

(1) For Beryllium (Be, atomic number = 4) in Bohr - Rutherford model: Draw a nucleus with 4 protons and 5 neutrons (approximate number of neutrons for most common isotope). Then draw 2 electrons in the first shell and 2 electrons in the second shell.
(2) For Calcium ion (Ca²⁺, atomic number = 20): Calcium atom has 20 electrons. Ca²⁺ has 18 electrons. In Lewis diagram, draw the symbol Ca²⁺.
(3) For Mg and O: Mg (2,8,2) loses 2 electrons to form Mg²⁺ and O (2,6) gains 2 electrons to form O²⁻. They form an ionic bond. Formula: MgO. Name: Magnesium oxide.
(4)

Chemical name	Chemical formula
2.Aluminum acetate	Al(CH₃COO)₃
3.Sodium chlorite	NaClO₂
4.Nickel(II) oxide	NiO
5.Ammonium hydroxide	NH₄OH
Chemical formula	Chemical name
1. Be(NO₃)₂	Beryllium nitrate
2.PbO	Lead(II) oxide
3.FeS	Iron(II) sulfide
4.HgCl	Mercury(I) chloride
5. SrSO₃	Strontium sulfite