Periodic Table Elements: Properties, Reactivity, and Bonding

What does the Periodic Table tell us about elements?

It tells us how heavy atoms are, how big they are, what they are made of, their properties, how they react, and what they'll react with.

What group of elements are known as Alkali metals?

Group 1 elements: Li (Lithium), Na (Sodium), K (Potassium), Rb (Rubidium), Cs (Cesium), Fr (Francium).

What is a characteristic of Alkali metals?

They have 1 electron in their outer shell and are soft, malleable, ductile, and good conductors of heat and electricity.

How do Alkali metals react with water?

They react vigorously with water, producing hydrogen gas.

What group of elements are known as Alkaline Earth Metals?

Group 2 elements: Be (Beryllium), Mg (Magnesium), Ca (Calcium), Sr (Strontium), Ba (Barium), Ra (Radium).

What is a characteristic of Alkaline Earth Metals?

They have 2 electrons in their outer shell and are denser and harder than Alkali metals.

What group of elements are known as Halogens?

Group 7 elements: F (Fluorine), Cl (Chlorine), Br (Bromine), I (Iodine), At (Astatine).

What is a characteristic of Halogens?

They have 7 electrons in their outer shell and are highly reactive, always combining with other elements.

What group of elements are known as Noble gases?

Group 8 elements: He (Helium), Ne (Neon), Ar (Argon), Kr (Krypton), Xe (Xenon), Rn (Radon).

What is a characteristic of Noble gases?

They have a full outer electron shell, are gases at room temperature, and are chemically stable and inert.

What are isotopes?

Isotopes are different versions of an element or atom that have different atomic masses but similar chemical properties.

What is the significance of valence electrons?

Valence electrons determine how an atom will react chemically; elements in the same column have the same number of valence electrons.

What is the difference between ionic and covalent bonding?

Ionic bonding involves the transfer of electrons, typically between metals and non-metals, while covalent bonding involves sharing electrons between non-metals.

What happens to an atom when it gains or loses electrons?

It becomes an ion; gaining electrons creates a negative ion, while losing electrons creates a positive ion.

What is the trend in reactivity for Alkali metals?

Reactivity increases as you go down the group.

What is the trend in atomic mass as you move down a group in the Periodic Table?

Atomic mass increases as you go down a family.

How do you determine the number of electrons that can be placed in each electron shell?

The number of electrons in each shell is determined by the formula 2n², where n is the shell level.

What is the relationship between atomic number and stability?

Atoms prefer to be chemically stable, which usually requires a full outer electron shell.

What is the difference in melting/boiling points between ionic and covalent compounds?

Ionic compounds generally have high melting and boiling points, while covalent compounds have lower melting and boiling points.

What is a proton?

A proton is a positively charged particle found in the nucleus of an atom.

What is an electron?

An electron is a negatively charged particle that orbits the nucleus of an atom.

What is a neutron?

A neutron is a neutral particle found in the nucleus of an atom.

What is the significance of the Periodic Table's arrangement?

Elements are arranged by increasing atomic number, which reflects their electron configuration and properties.

What happens to the number of valence electrons as you move across a period?

The number of valence electrons increases as you move from left to right across a period.