Front

What is an alkali metal?

Back

Alkali metals are elements in Group 1 of the periodic table, characterized by having one electron in their outermost shell. They are highly reactive and include elements like lithium (Li), sodium (Na), and potassium (K).

Front

What is an alkaline earth metal?

Back

Alkaline earth metals are elements in Group 2 of the periodic table, characterized by having two electrons in their outermost shell. They are less reactive than alkali metals and include elements like magnesium (Mg) and strontium (Sr).

Front

What is a halogen?

Back

Halogens are elements in Group 17 of the periodic table, known for their high reactivity and tendency to form salts with metals. They include fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).

Front

What is a noble gas?

Back

Noble gases are elements in Group 18 of the periodic table, characterized by having a full outer electron shell, making them very stable and unreactive. Examples include helium (He), neon (Ne), and argon (Ar).

Front

What is a metalloid?

Back

Metalloids are elements that have properties intermediate between metals and nonmetals. They are typically semiconductors and include elements like silicon (Si) and germanium (Ge).

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Front

What are transition metals?

Back

Transition metals are elements found in Groups 3 to 12 of the periodic table, known for their ability to form variable oxidation states and colored compounds. Examples include iron (Fe), copper (Cu), and nickel (Ni).

Front

What is the significance of group numbers in the periodic table?

Back

Group numbers indicate the number of valence electrons in the elements of that group, which helps predict their chemical behavior and reactivity.

Front

What is the significance of period numbers in the periodic table?

Back

Period numbers indicate the number of electron shells in the elements of that period, which affects their size and energy levels.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons, leading to greater stability.