Questions: Does any element with Z ≤ 92 match the description? If you checked yes, give the symbol of an element with Z ≤ 92 that matches. An element in Period 4 and Group 8A. A metalloid in Group 5A. An alkaline earth metal with a lower atomic number than lithium. A main-group element in Period 3.

Does any element with Z ≤ 92 match the description? If you checked yes, give the symbol of an element with Z ≤ 92 that matches. An element in Period 4 and Group 8A. A metalloid in Group 5A. An alkaline earth metal with a lower atomic number than lithium. A main-group element in Period 3.
Transcript text: description Does any element with $\mathrm{Z} \leq 92$ match the description? If you checked yes, give the symbol of an element with $Z \leq 92$ that matches. An element in Period 4 and Group 8A. A metalloid in Group 5A. An alkaline earth metal with a lower atomic number than lithium. A main-group element in Period 3.
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Solution

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Solution Steps

Step 1: Identify an element in Period 4 and Group 8A

Period 4 of the periodic table includes elements from potassium (K) to krypton (Kr). Group 8A is also known as Group 18, which contains the noble gases. In Period 4, the noble gas is krypton (Kr).

Step 2: Identify a metalloid in Group 5A

Group 5A, also known as Group 15, includes elements such as nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). Among these, arsenic (As) and antimony (Sb) are metalloids. Since arsenic (As) has an atomic number less than 92, it fits the criteria.

Step 3: Identify an alkaline earth metal with a lower atomic number than lithium

Alkaline earth metals are in Group 2 of the periodic table. The elements in this group with atomic numbers less than lithium (Li, atomic number 3) are hydrogen (H, atomic number 1) and helium (He, atomic number 2). However, neither of these are alkaline earth metals. Therefore, no such element exists.

Final Answer

  • An element in Period 4 and Group 8A: \(\boxed{\text{Yes, Kr}}\)
  • A metalloid in Group 5A: \(\boxed{\text{Yes, As}}\)
  • An alkaline earth metal with a lower atomic number than lithium: \(\boxed{\text{No}}\)
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