Question

Using the periodic table above and the trend for electronegativity, which of the following groups of elements is correctly listed
from least electronegative to most electronegative.
(1 point)
As, Br, Ca, Sr
Sr, As, Br, Ca
Ca, Sr, As, Br
Sr, Ca, As, Br

Answer 1

To determine the electronegativity of the given elements and correctly order them from least to most electronegative, we can use the general trend observed in the periodic table. Electronegativity generally increases across a period (from left to right) and decreases down a group (from top to bottom).

Here's the electronegativity trend for the elements in your groups:

- **Calcium (Ca)**: Located in group 2 (alkaline earth metals), it is relatively less electronegative.
- **Strontium (Sr)**: Located below calcium in group 2, it is even less electronegative than calcium.
- **Arsenic (As)**: Located in group 15, it is more electronegative than both calcium and strontium.
- **Bromine (Br)**: Located in group 17 (halogens), it is highly electronegative.

From this analysis, the order in terms of electronegativity from least to most electronegative is as follows:

1. **Strontium (Sr)**
2. **Calcium (Ca)**
3. **Arsenic (As)**
4. **Bromine (Br)**

Thus, the correct order is: **Sr, Ca, As, Br.**

None of the provided options exactly match this order, likely due to the inclusion of only the electronegativities for calcium and strontium. The closest, correct answer among the choices would be **Sr, Ca, As, Br** if it were there, or you can identify that **Sr, Ca, As, Br** is the correct sequence.

However, if based solely on the options given:
The closest to a correct ordering would be: **Sr, Ca, As, Br**.