An atom of tin has an atomic number of 50 and a mass number of 119 how many protons neutrons and electrons does this atom have

How can people protect themselves from hazardous weather?

An animal cell contains a nucleus and other organelles suspended in a watery solution that is encased in a flexible cell membrane. Which of the following physical models would best represent an animal cell?

Your lap feels warms because your laptop computer has been sitting on top it.

Pseudoephedrine elixir contains 30 milligrams per teaspoon. The daily retail sales limit for pseudoephedrine is 3.6 grams. How many ounces of elixir is equivalent to 3.6 grams?

Which planet is sometimes called Uranus's twin? Saturn Pluto Jupiter Neptune

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.