Question

galaxy ngc 9832, distance: 0.1 billion lightyears
wavelength: 400 nm energy: 3 ev uv
500 nm 2.5 ev blue
600 nm 2 ev green
700 nm 1.7 ev red
800 nm 1.5 ev infrared
age: 12 billion years

1. elements present: lead, iron
2. circle the heaviest element you listed in number 1
3. draw a neutral atom of the heaviest element below:

Explanation:

Step1: Determine atomic numbers

Lead (Pb) has an atomic number of 82 and iron (Fe) has an atomic number of 26. Higher atomic number means heavier element.

Step2: Identify the heavier element

Since 82 > 26, lead is the heavier element.

Step3: Draw a neutral lead atom

A neutral lead atom has 82 protons in the nucleus, 82 electrons in electron - shells around the nucleus, and the number of neutrons can vary (common isotope has 125 neutrons). The electron - shell configuration is 2, 8, 18, 32, 18, 4. You would draw a nucleus with 82 positive charges (protons), and then draw electron - shells with the appropriate number of electrons in each shell.

Answer:

1. Lead is the heavier element.
2. Circle lead.
3. Draw a nucleus with 82 protons, 82 electrons arranged in shells as 2, 8, 18, 32, 18, 4 around the nucleus, and appropriate number of neutrons (e.g., 125 for common isotope) in the nucleus.