d and f BLOCK ELEMENTS

Which element is represented by the symbol Cr?

• Cesium
• Calcium
• Chromium
• Carbon

What is the electronic configuration of the element with atomic number 27?

• [Ar] 3d⁶ 4s²
• [Ar] 3d⁷ 4s²
• [Ar] 3d⁸ 4s¹
• [Ar] 3d⁷ 4s¹

What is the electronic configuration of the element with atomic number 25?

• [Ar] 3d⁴ 4s²
• [Ar] 3d⁵ 4s²
• [Ar] 3d⁶ 4s¹
• [Ar] 3d⁵ 4s¹

What is the atomic number of the element with the electronic configuration [Ar] 3d¹⁰ 4s¹?

• 28
• 29
• 30
• 31

What is the atomic number of the element with the electronic configuration [Ar] 3d⁵ 4s¹?

• 23
• 24
• 25
• 26