Question

what element has an electron arrangement of: 2,8,4? none are correct ti si ca s question 4 (1 point) what element is the largest? cs k br f co

Explanation:

Step1: Determine element from electron - arrangement

The electron - arrangement 2,8,4 means the total number of electrons is 2 + 8+4=14. The atomic number of an element is equal to the number of electrons in a neutral atom. The element with atomic number 14 is Silicon (Si).

Step2: Determine the largest element based on atomic radius trends

Atomic radius increases down a group and decreases across a period. Cs (Cesium) is in Group 1 and Period 6, K (Potassium) is in Group 1 and Period 4, Br (Bromine) is in Group 17 and Period 4, F (Fluorine) is in Group 17 and Period 2, Co (Cobalt) is in Group 9 and Period 4. Cs has the largest atomic radius among them as it is in the lowest - numbered period and left - most group among the given elements.

Answer:

Question 1: C. Si
Question 2: A. Cs