Why do atoms always have an overall neutral charge?

How many covalent bonds join the atoms in a molecule of ammonia (nh3) ?

The curved top surface of a liquid column

Which two notations represent atoms that are isotopes of the same element? a. 12150sn and 11950sn b. 12150sn and 12150sn c. 198o and 199f d. 3917cl and 3919k?

The sea of electrons in metals acts as

How many moles of N are in 0.209 g of N2O?

Match each chemical with the correct use. 1. x-ray soft tissue organs 2. reduce pain and fever 3. anesthetic 4. treat acne A. benzoyl peroxide B. nitrous oxide C. acetylsalicylic acid D. barium

What subatomic particles do the following symbols represent in the atomic diagrams

2. You have 2 m3 of a mineral ore sample. It has a mass of 1 * 104 kg. Calculate the density of the ore sample and express your results in g/cm3 with appropriate scientific notation.

A sample of hydrogen was collected by water displacement at 23.0°C and an atmospheric pressure of 735 mmHg. Its volume is 568 mL.

What is loamy soil?