I don't understand you question if you put it a diff way I can answer
Answer:
it was invented in 1960
Explanation:
it was descibed as a wooden instrument ideally suited for gravity programmes in areas of limited latitude and temperature variations
Answer:
This question is incomplete, however, the unknown compound can be inferred to be "Lithium Bromide"
Explanation:
The unknown compound firstly is said to be an ionic compound. An ionic/electrovalent compound is a compound in which it's constituent ions transfer/receive electron(s). They are mostly made of group 1 and group 7 elements. Examples include NaCl, NaF, LiF and KCl.
Also, the ion (metallic ion) that produces a red flame test colour in a flame test is the <u>Lithium ion (Li⁺).</u> Also, when dissolved in water or hexane, the only halogen that produces a red/orange colour is bromine. Hence, the unknown ionic compound can be inferred to be Lithium Bromide.
We no longer use atoms of the same elements are identical in size, mass and properties.
A sorry if it’s wrong good luck
