Question

ts elementary : building elements
chapter pages
tool: interactive periodic t
ok, start to build a argon atom.
question
4 of 4
18
ar
drag objects here
electrons
3
2
1
orbitals
1s 2s 2pₓ 2pᵧ 2p_z 3s 3pₓ 3pᵧ 3p_z
electrons
e
done undo reset skip

Explanation:

Step1: Identify atomic number of Ar

Argon (Ar) has an atomic number of 18, so it has 18 electrons.

Step2: Fill orbitals by Aufbau principle

Fill lower energy orbitals first:

1. 1s orbital holds 2 electrons: $1s^2$
2. 2s orbital holds 2 electrons: $2s^2$
3. 2p orbitals ($2p_x, 2p_y, 2p_z$) each hold 2 electrons: $2p^6$
4. 3s orbital holds 2 electrons: $3s^2$
5. 3p orbitals ($3p_x, 3p_y, 3p_z$) each hold 2 electrons: $3p^6$

Verify total electrons: $2+2+6+2+6=18$

Step3: Map to the interface

Drag the following orbitals to the "Drag objects here" box, then add 2 electrons to each:

1. 1s, 2s, 2p$_x$, 2p$_y$, 2p$_z$, 3s, 3p$_x$, 3p$_y$, 3p$_z$
2. Assign electrons:

• Row 1 (1s): 2 electrons
• Row 2 (2s, 2p$_x$, 2p$_y$, 2p$_z$): 2 electrons each (total 8)
• Row 3 (3s, 3p$_x$, 3p$_y$, 3p$_z$): 2 electrons each (total 8)

Answer:

1. Drag all orbitals (1s, 2s, 2p$_x$, 2p$_y$, 2p$_z$, 3s, 3p$_x$, 3p$_y$, 3p$_z$) to the "Drag objects here" area.
2. Assign electrons as follows:

• Row 1 (1s): Fill the box with 2 electrons
• Row 2 (2s, 2p$_x$, 2p$_y$, 2p$_z$): Fill each box with 2 electrons
• Row 3 (3s, 3p$_x$, 3p$_y$, 3p$_z$): Fill each box with 2 electrons

Total electrons: 18, matching Argon's electron count.