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First: Identify the element from clue 16 ---- Period 6, Group 1. hint Cesium is answerName and Atomic number, please 2 points) Second: you must "cross a divide". When you land back on "solid ground" there is a silvery white metal with an average mass of 178.5 amu. From there --- add 7 protons! Identify the element and describe the final steps you used to solve this last clue! (4 points)

1 answer

To solve your clues, let's break it down step by step.

First Clue:

You mentioned Period 6 and Group 1. In the periodic table, elements are arranged in rows (periods) and columns (groups).

  • Period 6, Group 1 corresponds to Cesium (Cs).
  • Cesium has an atomic number of 55.

So, for your first question:

  • Element Name: Cesium
  • Atomic Number: 55 (2 points)

Second Clue:

The next step is to "cross a divide" and find a silvery white metal with an average mass of 178.5 amu. After analyzing the periodic table, the element that fits this description is Tantalum (Ta), which has an atomic mass of about 180.947 amu.

Now, you are instructed to "add 7 protons" to this element, which means you will find the element that is 7 places to the right of Tantalum on the periodic table:

  • Tantalum (Ta) has atomic number 73.
  • Adding 7 protons gives us: 73 + 7 = 80.

The element with atomic number 80 is Selenium (Se).

Summary of Steps:

  1. Identified the element for Period 6, Group 1 (Cesium, atomic number 55).
  2. Determined the silvery white metal with an approximate mass of 178.5 amu (Tantalum, atomic number 73).
  3. Added 7 protons to the atomic number of Tantalum (73 + 7 = 80), leading to selenium (atomic number 80).

Final Answers:

  • Element after adding 7 protons: Selenium (Se)
  • Steps to solve: Crossed the divide from Tantalum (average mass 178.5 amu) and calculated the new atomic number by adding 7 to Tantalum's atomic number, leading to Selenium.

This gives you the answers needed for both parts of the question!