Question

chemistry semester 1 exam on level 25-26
all of the following are correctly shown as increasing trends, except
ionization energy
atomic radius
electronegativity

Explanation:

Step1: Recall Periodic Trends

Ionization energy increases across a period (right) and up a group (top). Electronegativity also increases across a period and up a group. Atomic radius increases down a group (top to bottom) and decreases across a period (left to right).

Step2: Analyze Each Option

- **Ionization Energy**: Arrows (up, right) match the trend (increase across period, up group) – correct.
- **Atomic Radius**: Arrows (left, up) – atomic radius increases down (opposite of up) and left (matches left). But the "up" arrow is incorrect (should be down for increase). Wait, no: atomic radius increases as we go down a group (top to bottom) and left across a period (right to left). So the arrows for atomic radius are left (across period, increasing left) and up (group, but atomic radius increases down, so up is decreasing). So the atomic radius trend shown (left and up) is conflicting? Wait, no – let's re-express:
- Ionization Energy: across period (→) increase, up group (↑) increase – correct.
- Electronegativity: across period (→) increase, up group (↑) increase – correct.
- Atomic Radius: across period (←) increase (since left to right, radius decreases; so right to left, increases), down group (↓) increase (but the arrow is ↑, which is up group – atomic radius decreases up group, increases down group. So the atomic radius trend has an incorrect ↑ arrow (should be ↓ for increasing down). Wait, the options are about which trend is INCORRECTLY shown. Wait, the question is "All of the following are correctly shown as increasing trends, EXCEPT" – so which one is NOT a correct increasing trend.

Wait, let's re-express each trend's direction:
- Ionization Energy: increases **across a period (left to right)** and **up a group (bottom to top)**. So the arrows (↑, →) match (up group, right across period) – correct.
- Electronegativity: increases **across a period (left to right)** and **up a group (bottom to top)**. Arrows (↑, →) match – correct.
- Atomic Radius: increases **down a group (top to bottom)** and **left across a period (right to left)**. The arrows for atomic radius are ← (left across period, correct) and ↑ (up group, but atomic radius decreases up group – so ↑ is a decreasing trend, not increasing). So the atomic radius trend has an incorrect ↑ arrow (should be ↓ for increasing down group). Wait, but the options are the three choices: Ionization Energy, Atomic Radius, Electronegativity – which one is NOT correctly shown as increasing. Wait, maybe I misread the arrows. Let's check the arrows:

- Ionization Energy: arrow up (group) and right (period) – correct (increases up/right).
- Atomic Radius: arrow left (period) and up (group) – atomic radius increases left (correct, since right to left is increasing) but increases down (not up) – so up is decreasing. So the atomic radius trend's up arrow is wrong. But wait, the question is which is EXCEPT – so which trend is NOT correctly shown. Wait, no: the options are the three, and we need to find which one is NOT a correct increasing trend. Wait, maybe the atomic radius's arrows: left (across period, increasing left) and up (group, but atomic radius increases down group, so up is decreasing). So the atomic radius trend is shown with an up arrow, which is a decreasing trend, so the atomic radius trend is incorrectly shown as increasing (because up group, atomic radius decreases, so the up arrow is a decreasing trend, not increasing). Wait, but the other two (ionization, electronegativity) have up/right arrows, which are increasing. So the atomic radius trend is the one with an incorrect arrow (↑) for increasing, because up group, atomic radius decreases (so ↑ is a decreasing trend, not increasing). Therefore, the atomic radius trend is NOT correctly shown as an increasing trend. Wait, but let's confirm:

Wait, the question is "All of the following are correctly shown as increasing trends, EXCEPT" – so which one is NOT a correct increasing trend. So:

- Ionization Energy: arrows (↑, →) – increasing up/right – correct.
- Electronegativity: arrows (↑, →) – increasing up/right – correct.
- Atomic Radius: arrows (←, ↑) – increasing left (correct, since right to left is increasing) and up (but atomic radius decreases up, so ↑ is decreasing) – so the atomic radius trend has a non-increasing arrow (↑) – so this is the incorrect one. Wait, but maybe I got the arrows reversed. Wait, the atomic radius option's arrows: the left arrow is ← (so across period, left is increasing), and the up arrow is ↑ (group, up is increasing? No – atomic radius increases down group (so up group, it decreases). So ↑ is a decreasing trend, not increasing. Therefore, the atomic radius trend is incorrectly shown as increasing (because the ↑ arrow is a decreasing trend). So the answer is Atomic Radius.

Answer:

Atomic Radius (the option with arrows ← and ↑)