These are all the answers. Hope I helped
1. A
2. C
3. A
4. B
Sr will always have 38 protons because that is its atomic number. Normally Sr has 38 protons and 49 neutrons yielding an atomic mass of 87. unless you are dealing with an isotope of Strontium in which 3 additional neutrons would give you the 53 neutrons in your answer, (38p, 52n).
Explanation:
Water molecules are polar, so they form hydrogen bonds. This is a unique property of water. Water has an unique boiling point and high polarity.
