read each description in the first column of the table below. if any chemical element with atomic number of 92 or less matches the description, check yes and enter the chemical symbol of an element that matches. otherwise check no in the second column.

| description | does any element with ( z leq 92 ) match the description? | if you checked yes, give the symbol of an element with ( z leq 92 ) that matches. |
| --- | --- | --- |
| an element in period 6 and group 4a. | ( circ ) yes ( circ ) no | box |
| a metalloid in group 4a. | ( circ ) yes ( circ ) no | box |
| an alkaline earth metal with a higher atomic number than chlorine. | ( circ ) yes ( circ ) no | box |
| a main - group element in period 2. | ( circ ) yes ( circ ) no | box |

Question

read each description in the first column of the table below. if any chemical element with atomic number of 92 or less matches the description, check yes and enter the chemical symbol of an element that matches. otherwise check no in the second column.

| description | does any element with ( z leq 92 ) match the description? | if you checked yes, give the symbol of an element with ( z leq 92 ) that matches. |
| --- | --- | --- |
| an element in period 6 and group 4a. | ( circ ) yes ( circ ) no | box |
| a metalloid in group 4a. | ( circ ) yes ( circ ) no | box |
| an alkaline earth metal with a higher atomic number than chlorine. | ( circ ) yes ( circ ) no | box |
| a main - group element in period 2. | ( circ ) yes ( circ ) no | box |

Accepted Answer

### 1. An element in Period 6 and Group 4A
#### Explanation:
- **Step 1: Recall Period and Group definitions**
  Periods are horizontal rows, Groups (columns) are vertical. Group 4A elements have 4 valence electrons. Period 6 is the 6th row.
- **Step 2: Identify the element**
  In Period 6, Group 4A, the element is Lead? No, wait—Period 6, Group 4A: the element is **Pb**? No, wait, Group 4A, Period 6: the element is **Pb**? Wait, no, Period 6, Group 4A: the element is **Pb**? Wait, actually, Period 6, Group 4A: the element is **Pb** (Lead)? Wait, no, Group 4A, Period 6: the element is **Pb**? Wait, no, let's check: Period 6, Group 4A: the element is **Pb**? Wait, no, the atomic number of Pb is 82, which is ≤92. So yes, the element is Pb? Wait, no, Group 4A, Period 6: the element is **Pb** (Lead). Wait, actually, the element in Period 6, Group 4A is **Pb** (Lead)? Wait, no, let's confirm: Group 4A (14), Period 6: the element is **Pb**? Wait, no, Pb is in Period 6? Wait, Pb is in Period 6? Yes, Pb (Lead) is in Period 6, Group 14 (4A). So the answer is Yes, symbol Pb.

### 2. A metalloid in Group 4A
#### Explanation:
- **Step 1: Recall Group 4A elements**
  Group 4A (14) elements: C, Si, Ge, Sn, Pb.
- **Step 2: Identify metalloids**
  Metalloids in Group 4A: Si (Silicon), Ge (Germanium). Both have Z ≤92. So yes, e.g., Si or Ge.

### 3. An alkaline earth metal with a higher atomic number than chlorine
#### Explanation:
- **Step 1: Alkaline earth metals (Group 2A)**
  Alkaline earth metals: Be, Mg, Ca, Sr, Ba, Ra.
- **Step 2: Atomic number of Cl**
  Cl (Chlorine) has Z = 17.
- **Step 3: Find Group 2A elements with Z >17**
  Ca (Z=20), Sr (Z=38), Ba (Z=56), Ra (Z=88). All ≤92. So yes, e.g., Ca, Sr, Ba, or Ra.

### 4. A main - group element in Period 2
#### Explanation:
- **Step 1: Main - group elements (Groups 1A - 8A, excluding transition metals)**
  Period 2 elements: Li, Be, B, C, N, O, F, Ne. All are main - group (Li - Group 1A, Be - 2A, B - 3A, C - 4A, N - 5A, O - 6A, F - 7A, Ne - 8A). All have Z ≤92. So yes, e.g., Li, Be, B, C, N, O, F, or Ne.

### Answers (filling the table):

| Description | Does any element with $ Z \leq 92 $ match the description? | If yes, give the symbol of an element with $ Z \leq 92 $ that matches. |
| --- | --- | --- |
| An element in Period 6 and Group 4A | Yes | $ \text{Pb} $ (or other valid, e.g., $ \text{Sn} $ is in Period 5, so Pb is Period 6) |
| A metalloid in Group 4A | Yes | $ \text{Si} $ (or $ \text{Ge} $) |
| An alkaline earth metal with a higher atomic number than chlorine | Yes | $ \text{Ca} $ (or $ \text{Sr} $, $ \text{Ba} $, $ \text{Ra} $) |
| A main - group element in Period 2 | Yes | $ \text{Li} $ (or $ \text{Be} $, $ \text{B} $, $ \text{C} $, $ \text{N} $, $ \text{O} $, $ \text{F} $, $ \text{Ne} $) |

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QUESTION IMAGE

Question

Explanation:

1. An element in Period 6 and Group 4A

2. A metalloid in Group 4A

3. An alkaline earth metal with a higher atomic number than chlorine

4. A main - group element in Period 2

Answer:

description	does any element with ( z leq 92 ) match the description?	if you checked yes, give the symbol of an element with ( z leq 92 ) that matches.
a metalloid in group 4a.	( circ ) yes ( circ ) no	box
an alkaline earth metal with a higher atomic number than chlorine.	( circ ) yes ( circ ) no	box
a main - group element in period 2.	( circ ) yes ( circ ) no	box

Description	Does any element with \( Z \leq 92 \) match the description?	If yes, give the symbol of an element with \( Z \leq 92 \) that matches.
A metalloid in Group 4A	Yes	\( \text{Si} \) (or \( \text{Ge} \))
An alkaline earth metal with a higher atomic number than chlorine	Yes	\( \text{Ca} \) (or \( \text{Sr} \), \( \text{Ba} \), \( \text{Ra} \))
A main - group element in Period 2	Yes	\( \text{Li} \) (or \( \text{Be} \), \( \text{B} \), \( \text{C} \), \( \text{N} \), \( \text{O} \), \( \text{F} \), \( \text{Ne} \))