Question

galaxy ngc 11051, distance: 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

1. elements present: iron, hydrogen
2. circle the heaviest element listed in number 1
3. draw a neutral atom of the heaviest element → challenge! give it a try! this element will need more rings than you’re used to. from the middle, the rings can hold a maximum of 2 - 8 - 18 - 32 electrons

Explanation:

Step1: Identify heavier element

Iron is heavier than hydrogen.

Step2: Draw iron atom

Iron (Fe) has atomic number 26. First shell has 2 electrons, second has 8, third has 14 and fourth has 2. Draw nucleus with 26 protons (P) and 30 neutrons (N) (average atomic mass of Fe is about 56, so 56 - 26 = 30 neutrons). Then draw 4 electron - shells with 2, 8, 14, 2 electrons respectively.

Answer:

1. Elements are iron and hydrogen.
2. Circle iron.
3. Draw an atom with nucleus having 26 protons and 30 neutrons, and 4 electron - shells with 2, 8, 14, 2 electrons in order from innermost to outermost.