How many protons electrons and neutrons does ana tom with atomic number 50 and mass number 125 contain

Which of the following units is not an official si unit

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process

The point along a planet's orbit where it is closest to the sun is called the