Question

type the element in each list with the largest atomic mass: n, li, be →? br, f, at →? o, se, te →? si, cl, b →?

Explanation:

Step1: Recall atomic mass trends

Atomic mass generally increases down a group and across a period (left - to - right) in the periodic table.

Step2: Analyze N, Li, Be

N (nitrogen) has atomic number 7, Li (lithium) has atomic number 3, Be (beryllium) has atomic number 4. N has the largest atomic mass among them as it is further to the right in the periodic table.

Step3: Analyze Br, F, At

At (astatine) is at the bottom of the halogen group among Br (bromine), F (fluorine) and At. Atomic mass increases down the group, so At has the largest atomic mass.

Step4: Analyze O, Se, Te

Te (tellurium) is the bottom - most element among O (oxygen), Se (selenium) and Te in the chalcogen group. So Te has the largest atomic mass.

Step5: Analyze Si, Cl, B

Cl (chlorine) is further to the right in the periodic table compared to Si (silicon) and B (boron). So Cl has the largest atomic mass.

Answer:

N
At
Te
Cl