[Maximum number: 1]

Which pair of formulae is correct?

A

$\mathrm{Ag}_{2} \mathrm{CO}_{3}$ and $\left(\mathrm{NH}_{4}\right)_{3} \mathrm{NO}_{3}$

B

$\mathrm{K}_{2} \mathrm{HCO}_{3}$ and $\mathrm{Zn}_{3}\left(\mathrm{PO}_{4}\right)_{2}$

C

$\mathrm{AgHCO}_{3}$ and $\mathrm{K}_{3} \mathrm{PO}_{4}$

D

$\mathrm{ZnCO}_{3}$ and $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{PO}_{4}$

[Maximum number: 1]

Which atom has exactly three unpaired electrons in the ground state?

A

an isolated gaseous aluminium atom

B

an isolated gaseous carbon atom

C

an isolated gaseous chromium atom

D

an isolated gaseous phosphorus atom

[Maximum number: 1]

Which atom has its outermost electron in an orbital of the shape shown, with principal quantum number 3 ?

A

sodium

B

chlorine

C

calcium

D

bromine

[Maximum number: 1]

This question refers to isolated gaseous atoms.
In which atom are all electrons paired?

A

Ba

B

Br

C

S

D

Si

[Maximum number: 1]

Which ion has the same electronic configuration as $\mathrm{Cl}^{-}$ ?

A

$\mathrm{F}^{-}$

B

$\mathrm{P}^{+}$

C

$\mathrm{Sc}^{3+}$

D

$\mathrm{Si}^{4+}$

[Maximum number: 1]

Use of the Data Booklet is relevant to this question.
Atoms of element X have six unpaired electrons.
What could be element X ?

A

carbon

B

chromium

C

iron

D

selenium

[Maximum number: 1]

A simple ion $X^{+}$ contains eight protons.
What is the electronic configuration of $\mathrm{X}^{+}$ ?

A

$1 s^{2} \quad 2 s^{1} \quad 2 p^{6}$

B

$\begin{array}{rrr}1 s^{2} & 2 s^{2} & 2 p^{3}\end{array}$

C

$1 s^{2} \quad 2 s^{2} \quad 2 p^{5}$

D

$\begin{array}{rrr}1 s^{2} & 2 s^{2} & 2 p^{7}\end{array}$

[Maximum number: 3]

The elements phosphorus, sulfur and chlorine are in Period 3 of the Periodic Table.

Table 1.1 shows some properties of the elements P to Cl .
The first ionisation energy of S is not shown.

Table 1.1

(a)

(i)

Complete Table 1.1 to show the number of electrons in the 3 p subshell and the total number of unpaired electrons in an atom of P, S and C 1 .

[ 2 ]

(b)

$\mathrm{P}^{3-}, \mathrm{S}^{2-}$ and $\mathrm{Cl}^{-}$ have the same number of electrons.

[ 1 ]

(i)

Give the full electronic configuration of $\mathrm{P}^{3-}$ .

[ 1 ]

[Maximum number: 2]

The elements silicon, phosphorus and sulfur are in Period 3 of the Periodic Table.

(a)

Table 1.1 shows some properties of the elements Si to S .

The first ionisation energy of P is not shown.

Table 1.1

[ 2 ]

(i)

Complete Table 1.1 to show the total number of s and p electrons in an atom of Si, P and S .

[ 2 ]

[Maximum number: 1]

Copper is used in electrical equipment. It has a melting point of $1085^{\circ} \mathrm{C}$ .

(a)

When KI(aq) is added to $\mathrm{CuSO}_{4}(\mathrm{aq})$ the blue-coloured solution turns brown and a white precipitate of CuI(s) is seen.

The reaction between copper ions and iodide forms only two products.

[ 1 ]

(i)

State the full electronic configuration of $\mathrm{Cu}^{2+}$ .

[ 1 ]