The atomic number is the total number of protons in the nucleus. The mass number is the total number of particles in the nucleus. That includes the neutrons and the protons. So, the atomic number is 31. When you look at the element on the periodic table with a designated atomic number of 31, that would be Gallium, with a symbol of Ga. Mass number is 31 + 36 = 67. So, the answer is A.
D, Render aid and assistance. I learned this in my government/public administration class. If they don't they can be sued, and lose their job. It also slightly follows the 'Good Samaritan' law, but not fully.
The mass of an ink pen is constant no matter what instrument you use. If you weigh the ink pen on a simple platform balance, it would weigh <em>approximately 16 grams</em>. To measure this mass using a triple beam balance, follow these instructions:
1. Empty the pan, then move the three sliders on each of the beams to left ton the zero mark.
2. Place the ink pen on the pan. As a result, the beams are no longer on the zero mark. Slide the beams until the pointer is at zero.
3. To read the weight, add all the numbers in the three slider beams.
If you look on the periodic table, you'll find that oxygen is an element. You can also find out by looking up how each formula is written. Oxygen - O | Carbon Dioxide - CO2 | Water - H2O | Ammonia - NH3. An element has only one capital letter. Oxygen is the only one which falls under that category.