Which statement describes the earliest model of the atom?*

In all atoms of bismuth, the number of electrons must equal the*

Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?*

An orbital is a region in an atom where there is a high probability of finding*

Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?*

As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the*

Which element is classified as a metalloid?*

Strontium and barium have similar chemical properties because atoms of these elements have the same number of*

Which term represents the fixed proportion of elements in a compound?*

Which two terms represent types of chemical formulas?*

Which element has metallic bonds at room temperature?*

What is the number of electrons shared between the atoms in a molecule of nitrogen, N₂?*

Given the equation representing a reaction:

H + H → H₂

What occurs during this reaction?*

An atom of which element has the strongest attraction for electrons in a chemical bond?*

At STP, a 50.-gram sample of H₂O(ℓ) and a 100.-gram sample of H₂O(ℓ) have*