Which pair of elements below have + 3 ionic change?

A. Al and Ga

B. Sc and Y

Monica found a clear mineral crystal. She wanted to identify its hardness. She tried to scratch it with her fingernail, a penny, and a steel nail but none of those worked. Then she tried topaz, which did leave a scratch.

What did rutherford's gold-foil experiment tell about the atom? A) that an atom's nucleus and its electrons took up equal space B) that the atom mostly consisted of empty space C) that the atom mostly made up of negatively charged electrons D) that

The tendency for an object at rest to remain at rest is?

What are the horizontal rows of the periodic table called

Why doesnt acetaminophen react with either a base or an acid?

If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount. If the half-life of hydrogen-3 is 11.

If element X has 25 protons, how many electrons does it have?

How much work is done to raise a 20N box 4m?

Which of the following lists the types of single substances? (Select only one answer) Group of answer choices elements and mixtures suspensions, solutions, and colloids elements, compounds, and mixtures elements and compounds

What is the average mass of a single silicon atom in grams?