Fill in the blanks: (a) The symbol and atomic number of the...

Fill in the blanks: (a) The symbol and atomic number of the heaviest alkaline earth metal are _____________ and _________ (b) The symbol and atomic number of the lightest metalloid in Group 4 $\mathrm{A}(14)$ are $\longrightarrow$ and _________ (c) Group 1 $\mathrm{B}(11)$ consists of the coinage metals. The symbol and atomic mass of the coinage metal whose atoms have the fewest electrons are $\frac{\text { and }}{\text { and }}$ (d) The symbol and atomic mass of the halogen in Period 4 are_____and_____

Fill in the blanks:
(a) The symbol and atomic number of the heaviest alkaline earth metal are _____________ and _________
(b) The symbol and atomic number of the lightest metalloid in Group 4 $\mathrm{A}(14)$ are $\longrightarrow$ and _________
(c) Group 1 $\mathrm{B}(11)$ consists of the coinage metals. The symbol and atomic mass of the coinage metal whose atoms have the fewest electrons are $\frac{\text { and }}{\text { and }}$
(d) The symbol and atomic mass of the halogen in Period 4 are_____and_____

Key Concepts

Halogens

Halogens are elements found in Group 17 of the periodic table and are known for their high reactivity, particularly with alkali metals and alkaline earth metals. They exist in various physical states at room temperature and form salts when reacting with metals. Their reactivity trends and varying atomic masses influence how they participate in chemical processes, including the formation of diatomic molecules.

Periodic Table Organization

The periodic table arranges elements based on their atomic numbers and recurring chemical properties. Elements with similar behaviors are placed in the same groups (vertical columns), while periods (horizontal rows) indicate consecutive filling of electron shells. This organized layout helps predict the characteristics of unknown elements and understand periodic trends such as electronegativity, ionization energy, and atomic radii.

Atomic Number and Atomic Mass

Atomic number is the number of protons found in an element’s nucleus and serves as the unique identifier for each element. Atomic mass, on the other hand, is the weighted average mass of all the isotopes of an element, generally reflecting the number of protons and neutrons in typical atoms of the element. Both these concepts are fundamental for comparing elements and understanding their properties in chemical reactions.

Alkaline Earth Metals

Alkaline earth metals are found in Group 2 of the periodic table and share properties like higher melting points and the formation of basic oxides. Their reactivity and physical characteristics gradually change down the group, such that the heaviest alkaline earth metal is typically characterized by a larger atomic radius and a greater metallic character.

Metalloids

Metalloids are elements that exhibit properties intermediate between metals and nonmetals. They are often located along a 'staircase' line on the periodic table and are known for their ability to act as semiconductors. These elements typically have mixed properties and are crucial in various technological applications like electronics.

Coinage Metals

Coinage metals refer to the group of metals, especially in Group 11 of the periodic table, such as copper, silver, and gold, which are traditionally used in currency. They are characterized by good electrical conductivity, malleability, and resistance to corrosion. The variation in electron count among them, starting with the element having the fewest electrons, plays an important role in their distinct chemical and physical properties.

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