If an atom has an atomic number of 8 and a mass number of 18, how many protons, neutrons, and electrons are in the atom?

A scientist observed a 5-mL sample of an unknown substance. It is a blue liquid with a density of 1.2 g/cm. the substance reacts with carbon dioxide.

The electron configuration for aluminum (Al) is shown below: 1s22s22p63s23p1 Which diagram shows the correct distribution of electrons in the electron shells of an aluminum atom?

What would happen of scientific knowledge was not debated and confirmed by scientist?

Select the correct answer. Which of the following best describes half-life? A. half of the time it takes for the reaction to go to completion B. half of the initial rate of reaction for a given concentration C.

which of the following has to remain constant to allow you to use the combine gas law for calculations?

Which of these is a covalent compound? 1. AICI3 2. CO 3. MgO 4. LiCI

What is a protein used for

Atoms of the halogen family typically steal two electrons from other atoms when they react true or false

Looking at the periodic table, which group consists of elements that will not form an acid when combine with hydrogen? A) radon, neon, calcium B) neon, bromine, barium C) beryllium, iodine, krypton D) lithium, potassium, fluorine

Mixtures have (exact, relative) amounts of the same substances