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Explanation:
1. Atomic number 17 and mass number 35
2. protons=electrons so the total number of protons and electrons will be 17 same as the atomic number. the number of neutrons is 18, mass number -atomic number.
3.Electronic configuration= 2,8,7
total number of electrons in configuration should come 17 so this is the division of electrons in configuration.
4.valence electrons are= 7
5.Element X is chlorine as X has 17 atomic number which is same as chlorine. Its actual mass is 35.45amu. Usually we round off the mass number for ease of calculation.
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