properties of the elements\n*numbers are for educational purposes only and are not intended to be a…

properties of the elements\n*numbers are for educational purposes only and are not intended to be a reference source.\ndirections: answer all questions using the correct units if required.\n1 what temperature does lithium melt at?\n2 which substance has an atomic radius of 50 pm?\n3 which two elements have the closest atomic mass?\n4 which element has the lowest boiling point?\n5 how many degrees separate the boiling points of carbon and lithium?\n6 which is the largest atom?\n7 what is the relationship between atomic number and atomic mass?

properties of the elements\n*numbers are for educational purposes only and are not intended to be a reference source.\ndirections: answer all questions using the correct units if required.\n1 what temperature does lithium melt at?\n2 which substance has an atomic radius of 50 pm?\n3 which two elements have the closest atomic mass?\n4 which element has the lowest boiling point?\n5 how many degrees separate the boiling points of carbon and lithium?\n6 which is the largest atom?\n7 what is the relationship between atomic number and atomic mass?

Answer

Explanation:

Step1: Find lithium's melting - point

Check the table for lithium's melting - point value. It is 181.7°C.

Step2: Find element with atomic radius of 50 pm

Scan the atomic radius row in the table. Oxygen has an atomic radius of 50 pm.

Step3: Compare atomic masses

Helium has an atomic mass of 4.0 and lithium has an atomic mass of 6.9. These two are closest among the given elements.

Step4: Identify element with lowest boiling - point

Compare the boiling - point values. Oxygen has the lowest boiling - point at - 297°C.

Step5: Calculate difference in boiling points

The boiling point of carbon is 4827°C and that of lithium is 1342°C. The difference is (4827 - 1342=3485^{\circ}C).

Step6: Determine largest atom

Lithium has the largest atomic radius (145 pm) among the given elements, so it is the largest atom.

Step7: Analyze relationship

As the atomic number increases, the atomic mass generally increases, but not in a strictly linear fashion. For example, helium has atomic number 2 and atomic mass 4.0, lithium has atomic number 3 and atomic mass 6.9, carbon has atomic number 6 and atomic mass 12.0.

Answer:

  1. 181.7°C
  2. Oxygen
  3. Helium, Lithium
  4. Oxygen
  5. 3485°C
  6. Lithium
  7. As atomic number increases, atomic mass generally increases but not in a strictly linear fashion.