Metalloids — Unit test Answers

What is an atomic nucleus?

Rutherford used positively charged particles to investigate the structure of the atom. The results surprised him, and he developed the atomic model shown below.

Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?

Which statement describes the location of most metalloids on the periodic table?

This is how manganese appears in the periodic table.

Particle A has very little mass in comparison to Particle B. Both particles are in the same atom. Which is the best conclusion about Particles A and B?

While looking at bromine (Br) on the periodic table, a student needs to find another element with very similar chemical properties but with a different atomic mass. Which best describes the student’s options?

Sonya is studying a nonmetal element. She learns that the element is like other elements in its group because it can bond to form a salt or an acid. She also learns that the element is the most reactive element in its group. Which element is Sonya most likely studying?

What best describes the states of nonmetals when they are at room temperature?

The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?

Where are alkaline earth metals found on the periodic table?

Who was the first chemist to organize elements by atomic number?

Which scientist believed that the probable, not exact, location of the electrons of an atom can be determined by using mathematics?