Answer:
The naswer to your question is Scandium
Explanation:
43 means the atomic mass is normally presented as a power
21 means atomic number is always a subscript
₂₁ ? ⁴³
Technetium ₄₃Tc⁹⁸
Scandium ₂₁Sc⁴⁴
Titanium ₂₁Ti⁴⁷
Cobalt ₂₇Co⁵⁹
Answer:
the first and last
Explanation:
the enthalpy Change is positive.
please like and Mark as brainliest
Answer:
igneous rocks
Explanation:
igneous rocks forms from lava, such as obsidian, basalt, plumice, etc
A tetrahedral carbon is sp3 hybridized while a linear carbon is sp hybridized.
Carbon is a chemical element with the symbol C and atomic number 6. It is a non-metal and is tetravalent. That atom donates four electrons to form a covalent chemical bond. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025% of the Earth's crust.
Carbon is used in some form in almost every industry in the world. It is used as fuel in the form of coal, methane gas, and crude oil (used to make gasoline). It is used to manufacture all kinds of materials, including plastics and alloys such as steel (a combination of carbon and iron). Carbon is an essential element for all life forms on earth. Carbon uptake and release are part of all plant and animal life, whether these life forms take up carbon to help make food or release carbon as part of respiration. Carbon is in constant motion from place to place.
Learn more about carbon here
brainly.com/question/141693
#SPJ4
D = 21.45 g/cm³
V = 78.00 cm³
D = m / V
21.45 = m / 78.00
m = 21.45 x 78.00
m = 1673.1 g
hope this helps!
