Question

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Answer 1

Answer:

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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.