The answer is the number of protons.
explanation: The number of protons in one atom of an element determines the atoms identity, and the number of electrons determines its electrical charge.
Answer:
When a solid changes into a gas, it is called sublimation.
Explanation:
Answer:
the answer is d which is soap solution because it's a soap solution that can measure the degree of hardness of a water if the water forms with this soap solution then the water is hard but if the water forms foam with soap then it is soft
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