Atoms of which element contain 25 protons? magnesium (Mg) aluminum (Al) tin (Sn) manganese (Mn)

Citric acid has a pH between 1 and 3. It is considered to be a

MgBr2 metal or non metal

Which atmosphere layer is represented by F what are its characteristics

What is the pH of a 0.45 M solution of hydrochloride acid (H

What is the best thing to study in Antartica?

What shape is the magnetic field produced when current is passed through a wire? a. Parabolic b. Elliptical c. Circular d. Bimodal

What year was the hole in the ozone layer detect in the antarctica?

Sodium (NA) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have? A) 0 B) 1 C) 9 D) 11

Which of the following is not caused by the moon? a. moonrise b. tides c. eclipses d. sunrise

Approximately how many mineral species have scientists identified? 250 5000 1500 60