Beryllium, Be, has atomic number 4 - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Question 2
Beryllium, Be, has atomic number 4.
(a) Complete the sentence by putting a cross (X) in the box next to your answer.
From its position in the periodic table (page ... show full transcript
Worked Solution & Example Answer:Beryllium, Be, has atomic number 4 - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
Beryllium is most likely to be a metal (A).
Step 2
Give the symbol of an atom of another element in the same period of the periodic table as beryllium.
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Answer
An acceptable answer is Li (Lithium) or B (Boron).
Step 3
State the numbers of protons, electrons and neutrons in this atom of beryllium.
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Answer
Beryllium has:
4 protons
4 electrons
5 neutrons (mass number 9 - atomic number 4 = 5).
Step 4
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The relative charge on an electron is C -1.
Step 5
Explain, in terms of its electronic configuration, why phosphorus is in group 5 of the periodic table.
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Answer
Phosphorus has 5 electrons in its outermost shell. Since it has 5 outer (or valence) electrons, it belongs to group 5 in the periodic table. This arrangement indicates the number of electrons in the outer shell, which is crucial for determining its group placement.
