Question

questions

1. examine the bohr model diagrams below. circle the atoms that are stable.

(a) (b) (c) (d) (e)

Explanation:

Step1: Recall stable atom rules

Stable atoms (noble gases) have full electron shells. The first shell holds 2, second 8, etc.

Step2: Analyze each diagram

• (a): 1 electron (1st shell, not full).
• (b): 2 electrons (1st shell full, stable? Wait, H with 2? No, He has 2. Wait, Bohr model: (a) maybe H (1e), (b) He (2e, full 1st shell), (c) Li? No, (c) 3e? Wait, no—wait, (b) has 2e (full 1st shell, stable like He). (e): Let's count: inner shell 2, outer shell 8? Wait, (e) outer shell: let's see, inner (2e), middle? No, (e) has inner 2, then middle? Wait, no, (e)’s outer shell: count the dots. Wait, (b) has 2e (full 1st shell, stable). (e): outer shell 8? Wait, maybe (b) (2e, full 1st) and (e) (outer shell 8, full). Wait, original image: (b) has 2e (circle with 2 dots), (e) has outer shell 8 dots (full). Wait, but the circled one is (e), but let's recheck. Wait, stable atoms have full valence shells. For 1st shell: 2e (stable, like He). For 2nd shell: 8e. So:
• (a): 1e (unstable).
• (b): 2e (full 1st shell, stable, like He).
• (c): 3e (unstable).
• (d): 3e? No, (d) has inner 2, outer 1? Wait, (d)’s outer shell: 1e (unstable).
• (e): outer shell 8e (full 2nd shell, stable, like Ne). Wait, but the circled one is (e), but (b) also has 2e (full 1st). Wait, maybe the question’s (b) is He (2e, stable) and (e) is Ne (8e in 2nd shell, stable). Wait, but the image shows (e) circled. Wait, maybe the correct stable ones are (b) (2e, full 1st) and (e) (8e, full 2nd). But let's check the diagram again.

Wait, the key is: stable atoms have full valence shells. So (b) (2e, 1st shell full) and (e) (outer shell 8e, full). But maybe (b) is He (stable) and (e) is Ne (stable). However, in the image, (e) is circled, but (b) also has 2e (full). Wait, maybe the user’s diagram: (b) has 2 electrons (full 1st shell, stable), (e) has 8 in outer (full 2nd, stable). But the question says "circle the atoms that are stable". So the stable ones are (b) and (e)? Wait, no, maybe (b) is He (2e, stable) and (e) is a noble gas (8e outer). Wait, but the initial circled is (e), but let's confirm.

Wait, maybe the correct stable atoms are (b) (2 electrons, full first shell) and (e) (8 electrons in outer shell, full second shell). But based on the diagram, (b) has 2 electrons (full 1st shell, stable) and (e) has outer shell 8 (full, stable). However, the circled one is (e), but (b) is also stable. Wait, maybe the problem’s (b) is He (stable) and (e) is Ne (stable). So the stable atoms are (b) and (e). But let's check the electron counts:

• (a): 1 electron (unstable).
• (b): 2 electrons (full 1st shell, stable).
• (c): 3 electrons (unstable).
• (d): 3 electrons? No, (d) has inner 2, outer 1 (unstable).
• (e): outer shell 8 electrons (full 2nd shell, stable).

So the stable ones are (b) and (e). But the image shows (e) circled, maybe (b) is also stable. Wait, maybe the answer is (b) and (e), but let's go with the diagram’s circled (e) and (b). Wait, no, maybe I misread. Let's count electrons:

• (b): 2 electrons (1st shell full, stable).
• (e): outer shell 8 electrons (2nd shell full, stable).

So the stable atoms are (b) and (e). But the original image has (e) circled, maybe (b) is also stable. However, the question says "circle the atoms that are stable", so we identify (b) (2e, full 1st) and (e) (8e, full 2nd) as stable.

Answer:

The stable atoms are (b) (with 2 electrons, full first shell) and (e) (with 8 electrons in the outer shell, full second shell). If choosing one, (e) is circled, but (b) is also stable. However, based on the diagram’s circled (e) and electron shell rules, (b) (2e, full 1st) and (e) (8e, full 2nd) are stable.