This question is about atomic structure and elements - AQA - GCSE Chemistry - Question 1 - 2015 - Paper 1
Question 1
This question is about atomic structure and elements.
1 (a) Complete the sentences.
1 (a) (i) The atomic number of an atom is the number of .......................... show full transcript
Worked Solution & Example Answer:This question is about atomic structure and elements - AQA - GCSE Chemistry - Question 1 - 2015 - Paper 1
Step 1
1 (a) (i) The atomic number of an atom is the number of...
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
protons.
Step 2
1 (a) (ii) The mass number of an atom is the number of...
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
protons plus neutrons.
Step 3
1 (b) Explain why an atom has no overall charge.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
An atom has no overall charge because it contains equal numbers of protons and electrons. Protons are positively charged particles, while electrons have a negative charge. Since these charges are equal in magnitude and opposite in sign, they cancel each other out, resulting in a neutral atom.
Step 4
1 (c) Explain why fluorine and chlorine are in the same group of the periodic table.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Fluorine and chlorine belong to the same group of the periodic table because they have similar electronic structures. Fluorine has an electronic structure of 2,7, and chlorine has an electronic structure of 2,8,7. Both elements have seven electrons in their outer shell, contributing to their similar chemical properties.
Step 5
1 (d) What is the chemical symbol of this non-metal?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
S
Step 6
1 (e) (i) Compounds formed when non-metals react with metals consist of particles called...
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
ions.
Step 7
1 (e) (ii) Compounds formed from only non-metals consist of particles called...
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
