In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table. These letters are not the symbols of the atoms of these elements. (a) Using the letters A, E, G, J and Z (i) give the letters of the two elements that are non-metals. (ii) give the letters of two elements in period 2. (iii) give the letter of an element that normally forms an ion with a charge of +1. (iv) All atoms of element E in this sample contain A 5 protons B 5 neutrons C 6 protons D 6 neutrons (c) Element X has an atomic number of 18. State the electronic configuration of an atom of element X. (d) In an experiment, 3.5 g of element A reacted with 4.0 g of element G to form a compound. Calculate the empirical formula of this compound. (relative atomic masses: A = 7, G = 16) You must show your working. (e) An oxygen atom has six electrons in its outer shell. A hydrogen atom has one electron in its outer shell. Complete the dot and cross diagram of a molecule of water, H₂O. Show outer shell electrons only.

GCSE Edexcel Chemistry Combined Science Group 0 - Noble Gases: In Figure 5, the letters A, E, G

In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2019 - Paper 1

Question 5

In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table. These letters are not the symbols of the atoms of these eleme... show full transcript

Worked Solution & Example Answer:In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2019 - Paper 1

Step 1

Using the letters A, E, G, J and Z (i) give the letters of the two elements that are non-metals.

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Answer

The non-metals in this arrangement are E and G.

Step 2

Using the letters A, E, G, J and Z (ii) give the letters of two elements in period 2.

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Answer

The two elements in period 2 are E and J.

Step 3

Using the letters A, E, G, J and Z (iii) give the letter of an element that normally forms an ion with a charge of +1.

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Answer

The element that normally forms an ion with a charge of +1 is J.

Step 4

All atoms of element E in this sample contain (iv) A 5 protons B 5 neutrons C 6 protons D 6 neutrons.

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Answer

The correct answer is A: 5 protons.

Step 5

Element X has an atomic number of 18. State the electronic configuration of an atom of element X.

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Answer

The electronic configuration of element X is 2.8.8.

Step 6

In an experiment, 3.5 g of element A reacted with 4.0 g of element G to form a compound. Calculate the empirical formula of this compound.

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Answer

To find the empirical formula, first calculate the moles of each element:

For element A: $ext{Moles of A} = \frac{3.5 ext{ g}}{7 ext{ g/mol}} = 0.5 ext{ moles}$

For element G: $ext{Moles of G} = \frac{4.0 ext{ g}}{16 ext{ g/mol}} = 0.25 ext{ moles}$

Now divide each by the smallest number of moles:

For A: $\frac{0.5}{0.25} = 2$

For G: $\frac{0.25}{0.25} = 1$

Therefore, the empirical formula is A₂G.

Step 7

An oxygen atom has six electrons in its outer shell. A hydrogen atom has one electron in its outer shell. Complete the dot and cross diagram of a molecule of water, H₂O. Show outer shell electrons only.

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Answer

In the dot and cross diagram for water (H₂O), indicate that oxygen shares its six outer shell electrons with two hydrogen atoms, each contributing one electron:

Represent oxygen's electrons with dots and hydrogen's electrons with crosses.
The diagram would illustrate two overlaps between the oxygen and the hydrogen atoms for the bonds.

In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2019 - Paper 1

Worked Solution & Example Answer:In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2019 - Paper 1

Using the letters A, E, G, J and Z (i) give the letters of the two elements that are non-metals.

Using the letters A, E, G, J and Z (ii) give the letters of two elements in period 2.

Using the letters A, E, G, J and Z (iii) give the letter of an element that normally forms an ion with a charge of +1.

All atoms of element E in this sample contain (iv) A 5 protons B 5 neutrons C 6 protons D 6 neutrons.

Element X has an atomic number of 18. State the electronic configuration of an atom of element X.

In an experiment, 3.5 g of element A reacted with 4.0 g of element G to form a compound. Calculate the empirical formula of this compound.

An oxygen atom has six electrons in its outer shell. A hydrogen atom has one electron in its outer shell. Complete the dot and cross diagram of a molecule of water, H₂O. Show outer shell electrons only.

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