atoms and elements

Mendeleev arranged the periodic table according to increasing

The Lanthanide Series  would contain which element?

A negatively charged atom is called a/an

Isotopes are atoms of the same element with different numbers of

Democritus was the first to record that matter is made of tiny particles called atomos (atoms)

How many neutrons are present in Carbon-14?

The smallest particle of matter with the properties of that matter is

Argon is a member of this familly

Halogen ions have a charge of 

A sulfur ion would have a charge of

Electrons stay  around the atom  because opposite charges

Which polyatomic ion is this the formula for?   ClO₂^1-

This element is a transition element

An atom containing 7 electrons, 7 protons, and 8 neutrons would have a charge of

This is the correct equation for the formation of the phosphorus ion:  P -->  P^3- + 3 e-

These are found on the left side of the periodic table

The formula for the Gallium ion is

JJ Thompson discovered the

How many protons and then neutrons are in an atom of Uranium-238?

Which element has 24 protons?

What is the formula for the fluoride ion?

An atom with the same number of neutrons as ¹³¹ ₅₄Xe would be

An element in Group IIA is known as a/an

These are formed when atoms gain electrons.

How many protons and then electrons are in Al³⁺?

Rutherford discovered the 

What is the mass number for an isotope of calcium that has 22 neutrons?

What is the symbol for iron?

Elements within a period tend to have similar properties.

This number never changes in an element