Question

directions: below are several elements in a series. write their symbols to create that represents a branch of science. 17. bismuth - oxygen - l - oganesson - yttrium (study of living things) 18. arsenic - t - r - oxygen - nobelium - m - yttrium (study of space and the universe) 19. phosphorus - hydrogen - yttrium - silicon - cesium (study of matter and its motion) 20. carbon - helium - m - iodine - sulfur - t - r - yttrium (study of the properties of matter and its interactions) 21. germanium - oxygen - l - oganesson - yttrium (study of earth’s structure and processes)

Explanation:

Problem 17:

Step1: Find symbols of elements

Bismuth (Bi), Oxygen (O), L (we need to find the element with symbol L? Wait, no, maybe it's a typo or we need to form a word. Wait, the study of living things is Biology. Let's check the symbols: Bi (Bismuth), O (Oxygen), L? Wait, no, maybe the elements are Bi, O, then we need to form "BIOLOGY". Wait, Bismuth (Bi), Oxygen (O), then L? Wait, no, maybe the third element is L? Wait, no, Oganesson (Og), Yttrium (Y). Wait, Bi, O, L, Og, Y. Wait, maybe L is a mistake, or maybe it's "Biology". Let's check: Bi (Bi), O (O), L? No, maybe the correct elements: Bi, O, then we need "L" as in "Biology" – wait, Biology is Bi + O + L + O + G + Y? Wait, no, Oganesson is Og. Wait, Bismuth (Bi), Oxygen (O), L (maybe Lithium? No, Li). Wait, no, the study of living things is Biology. So the symbols should be Bi (Bismuth), O (O), L (maybe a typo, but let's see: Bi, O, L, Og, Y. Wait, Bi + O + L + Og + Y? No, Biology is B-I-O-L-O-G-Y? Wait, no, elements: Bi (Bismuth), O (Oxygen), L (maybe a mistake, but the correct word is Biology. So the symbols are Bi, O, L (maybe a typo, but assuming L is part of it), Og (Oganesson), Y (Yttrium). Wait, Bi + O + L + Og + Y? No, Biology is B-I-O-L-O-G-Y, but with elements: Bi (B), O (O), L (L), Og (O), Y (Y)? No, Oganesson is Og. Wait, maybe the elements are Bi, O, L, Og, Y to form "BIOLOGY" (Bi, O, L, O, G, Y – but Oganesson is Og, so Og is O and G? No, Og is Oganesson, symbol Og. So Bi (Bi), O (O), L (L), Og (Og), Y (Y) – Bi + O + L + Og + Y = BIOLOGY (Bi, O, L, O, G, Y? No, Og is Oganesson, so Og is O and G? No, the symbol is Og. So maybe the intended is Bi (Bi), O (O), L (L), O (O) – but there's no O again. Wait, maybe the problem has a typo, but the study of living things is Biology, so the symbols are Bi (Bismuth), O (Oxygen), L (maybe a mistake, but let's proceed). So the symbols are Bi, O, L, Og, Y.

Step2: Combine symbols

Combining the symbols: Bi (Bismuth), O (Oxygen), L (let's say L is just L), Og (Oganesson), Y (Yttrium) – but actually, Biology is formed by Bi (Bi), O (O), L (L), O (O), G (G), Y (Y) – but Oganesson is Og (O and G), so maybe Og is used for O and G. So Bi + O + L + Og + Y = BIOLOGY.

Step1: Find symbols of elements

Arsenic (As), T (need to find element with symbol T? No, study of space and universe is Astronomy. So symbols: As (Arsenic), T (Titanium? No, Ti), R (Rhenium? No, Re), O (Oxygen), No (Nobelium), M (Manganese? No, Mn), Y (Yttrium). Wait, Astronomy: A-S-T-R-O-N-O-M-Y. So elements: As (Arsenic), T (Titanium? No, Ti), R (Rhenium? No, Re), O (Oxygen), No (Nobelium), M (Manganese? No, Mn), Y (Yttrium). Wait, As (As), T (T), R (R), O (O), No (No), M (M), Y (Y) – As + T + R + O + No + M + Y = ASTRONOMY.

Step2: Combine symbols

Combining the symbols: As (Arsenic), T (T), R (R), O (O), No (Nobelium), M (M), Y (Y) – forming ASTRONOMY.

Step1: Find symbols of elements

Phosphorus (P), Hydrogen (H), Yttrium (Y), Silicon (Si), Cesium (Cs). Study of matter and its motion is Physics. So symbols: P (Phosphorus), H (Hydrogen), Y (Yttrium), Si (Silicon), Cs (Cesium) – P + H + Y + Si + Cs = PHYSICS.

Step2: Combine symbols

Combining the symbols: P (Phosphorus), H (Hydrogen), Y (Yttrium), Si (Silicon), Cs (Cesium) – forming PHYSICS.

Answer:

Bi, O, L, Og, Y (forming BIOLOGY)

Problem 18: