Match each of the lettered items in the column on the left...

Match each of the lettered items in the column on the left with the most appropriate numbered item(s) in the column on the right. Some of the numbered items may be used more than once and some not at all. (a) TI (b) $Z=70$ (c) Ni (d) $[\mathrm{Ar}] 4 s^{2}$ (e) a metalloid (f) a nonmetal 1. an alkaline earth metal 2. element in period 5 and group 15 3. largest atomic radius of all the elements 4. an element in period 4 and group 16 5. $3 d^{8}$ 6. one $p$ electron in the shell of highest $n$ 7. lowest ionization energy of all the elements 8. an $f$ -block element

Match each of the lettered items in the column on the left with the most appropriate numbered item(s) in the column on the right. Some of the numbered items may be used more than once and some not at all. (a) TI
(b) $Z=70$
(c) Ni (d) $[\mathrm{Ar}] 4 s^{2}$
(e) a metalloid
(f) a nonmetal 1. an alkaline earth metal
2. element in period 5 and group 15
3. largest atomic radius of all the elements
4. an element in period 4 and group 16
5. $3 d^{8}$
6. one $p$ electron in the shell of highest $n$
7. lowest ionization energy of all the elements
8. an $f$ -block element

Key Concepts

Atomic Number and Its Significance

The atomic number, representing the number of protons in an atom's nucleus, fundamentally determines its identity and its electron configuration. It plays a key role in positioning an element on the periodic table and affects its chemical behavior and physical properties.

Block Classification in the Periodic Table

Elements are arranged in blocks (s, p, d, and f) corresponding to the subshell in which the last electron is added. Knowledge of block classification helps in identifying characteristic properties of elements, such as the distinct behavior of transition metals and f?block elements.

Periodic Table Trends in Atomic Properties

Periodic trends such as atomic radius and ionization energy are predictable changes in properties as one moves across a period or down a group. These trends arise from variations in nuclear charge, electron shielding, and the distance of electrons from the nucleus, and are essential for comparing the properties of elements.

Electron Configuration Notation

This concept refers to the method of representing the arrangement of electrons in an atom’s orbitals using a shorthand notation that often starts with the electron configuration of a noble gas. Understanding electron configuration is crucial for predicting chemical behavior, reactivity, and grouping of elements on the periodic table.

Element Classification and Grouping

Elements are categorized into metals, nonmetals, and metalloids based on their physical and chemical properties, as well as into specific groups like the alkaline earth metals which have characteristic electron configurations. This classification aids in understanding similarities and differences in reactivity and properties among elements.

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