Atoms & The Periodic Table

What is the name given to elements next to the darkened stair-step on the periodic table?

A set of properties repeats from...

Which subatomic particle has a negative charge?

Atoms of the most reactive elements tend to have...

Democritus thought that matter was made up of tiny particles...

Atomic mass of an element is determined by a weighted average of the masses of isotopes present in nature.

Which general statement does NOT apply to metals?

The most reactive metals are located on the far left of the periodic table.

JJ Thomson's experiments provided evidence that an atom...

The usefulness of Mendeleev's periodic table was confirmed by...

Mendeleev arranged known chemical elements according to increasing...

An atom that gains or loses electrons is called...

Which of the following is unique for any given element?

What element has this electron configuration 1s²2s²2p⁵

Which statement is true about carbon-12 and carbon-13?

How many electrons does a d-orbital hold?

Which halogen (group 17) is most likely to react?

Alkaline Earth metals have...

How many valence electrons do elements in group 15/5A have?

Two highly reactive elements in period 4 are the metal potassium and the...

Who provided evidence for the existence of a nucleus in an atom?

How many energy levels would the electrons of calcium occupy?

Positive charge is...

If a neutral atom has 11 protons and loses 1 of it's electrons, then it's overall charge will be

How many neutrons would the most common isotope of Silicon have?