Question

Traids in the modern periodic table​

Answer 1

Answer:

Triad name[2] Elements and atomic masses[2][3]

Element 1

Mass Element 2

Mean of 1 and 3

Actual mass Element 3

Mass

Alkali-forming elements Lithium

6.94 Sodium

23.02

22.99 Potassium

39.10

Alkaline-earth-forming elements

[atomic masses verification needed] Calcium

40.1 Strontium

88.7

87.6 Barium

137.3

Salt-forming elements Chlorine

35.470 Bromine

80.470

78.383 Iodine

126.470

Acid-forming elements Sulfur

32.239 Selenium

80.741

79.263 Tellurium

129.243

Iron triad

[atomic masses verification needed] Ironp

55.8 Cobalt

57.3

58.9 Nickel

58.7