In which period of the periodic table do the elements have a core-electron configuration that is the same as argon.
Question 5 options:
a) first
b) second
c) third
d) fourth
e) fifth
The elements with a core-electron configuration that is the same as argon are located in the fourth period of the periodic table. Therefore, the correct answer is:
d) fourth
The elements with a core-electron configuration that is the same as argon can be found in the third period of the periodic table.
Therefore, the correct option is:
c) third
To determine the period of the periodic table in which elements have a core-electron configuration that is the same as argon, we need to understand the concept of electron configuration and the periodic table.
1. Electron Configuration: Electron configuration describes how electrons are distributed within an atom's energy levels or electron shells. Each shell can hold a specific number of electrons.
2. Periodic Table: The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties.
Argon (Ar) is located in the 3rd period of the periodic table. To find the elements with core-electron configurations equivalent to argon, we need to look for elements in the same period or row.
Now let's analyze the options given:
a) First Period: The first period of the periodic table only contains two elements, hydrogen (H) and helium (He). Neither of them has the same core-electron configuration as argon. Therefore, option a) is incorrect.
b) Second Period: The second period contains elements from lithium (Li) to neon (Ne). Though neon has the same core-electron configuration as argon (1s² 2s² 2p⁶), it is not the same period as argon itself. Therefore, option b) is incorrect.
c) Third Period: The third period consists of elements from sodium (Na) to argon (Ar). Since argon itself is in this period, it has the same core-electron configuration as argon. Therefore, option c) is correct.
d) Fourth Period: The fourth period starts with potassium (K) and continues until krypton (Kr). The core-electron configuration of argon is not found in this period. Therefore, option d) is incorrect.
e) Fifth Period: The fifth period begins with rubidium (Rb) until xenon (Xe). It does not contain the same core-electron configuration as argon. Therefore, option e) is incorrect.
In conclusion, the correct answer is c) third period.