Chlorine has an atomic number of 17.

how many protons are in an atom of chlorine?

a. 17

b. 18

c. 35

d. 52

The correct answer is Option A.

Explanation:

Atomic number is defined as the number of protons or number of electrons that are present in a neutral atom.  It is represented by the symbol 'Z'

Z = Atomic number = number of protons = number of electrons

We are given:

Atomic number of chlorine = 17

So, number of protons = 17

Hence, the correct answer is Option A.

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hope that

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.