Which is a compound?
a. iodine.
b. water.
c. calcium.
d. air.

Answer:

chromium atomic mass 52.00 atomic number is 24 period 4 group 6 6b

Explanation:

I checked the periodic table hope I helped

Answer:A

Explanation: Were there any living organisms is the answer because physics is the study of matter,its motion and behaviour of space and time and some other topics like energy and force.

Answer:

B

Explanation:

Forces and vectors on a probe are a physics thing

Answer : The correct option is,

Explanation :

Electronic configuration : It is defined as the arrangement of the electrons of an atom in an atomic orbital.

The given element is, nitrogen.

The nitrogen element belongs to group 15 and the atomic number of nitrogen is 7.

As we know that the number of electrons is equal to the number of atomic number.

The number of electrons present in nitrogen = 7

Thus, the electronic configuration of nitrogen is,

1s22s22p3 considering N is the third element in the 2nd P sublevel

Iron (III) hydroxide is the least soluble compound as it has the lowest Ksp value.

What is solubility of a solute?

The solubility is the amount of solute that can dissolve in a given volume of solvent at a particular temperature.

The solubility of substances can be compared using their their solubility products constant (Ksp) values.

Iron (III) hydroxide has the lowest Ksp value.

Therefore, Iron (III) hydroxide is the least soluble compound.

Learn more about solubility at: brainly.com/question/24057916

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Answer:3

Explanation:

stated

Na- 11=22

H-1 =1

C-12=12

O3=16*3 =48

total = 22+1+12+48 = 83

83-----> 48

100-----> 100*48/83=57.83 = 57.13 is nearest answer

Democritus, an ancient Greek philosopher who lived around 460-370 BCE, made significant contributions to the early development of the atomic theory.

His ideas laid the foundation for the later development of modern atomic theory. Here's how Democritus contributed to the atomic theory and the structure of the atom:

Concept of Indivisible Atoms: Democritus proposed that everything in the physical world was made up of tiny, indivisible particles called "atoms." The word "atom" itself is derived from the Greek word "atomos," which means "indivisible" or "uncuttable." Democritus believed that atoms were the fundamental building blocks of matter and that they could not be divided into smaller parts.

Various Shapes and Sizes: Democritus suggested that atoms could vary in shape and size. He proposed that different substances were composed of atoms with different shapes, which explained the diversity of matter in the universe.

Empty Space: Democritus also introduced the idea of "void" or empty space between atoms. He believed that atoms were in constant motion and that the void allowed for this motion.

Lack of Experimental Evidence: It's important to note that while Democritus made these philosophical speculations about atoms, he did not provide any experimental evidence to support his ideas. His atomic theory was largely based on reasoning and thought experiments rather than empirical data.

Democritus' atomic ideas were influential, but they were largely overshadowed by the more prominent theories of his contemporary, Aristotle, which emphasized the existence of four fundamental elements (earth, water, air, and fire). It wasn't until much later, in the 19th century, that John Dalton and others developed the modern atomic theory, which incorporated experimental evidence and refined our understanding of atoms as the smallest units of matter that retain the properties of chemical elements.

Democritus contributed to the atomic theory by proposing the concept of indivisible atoms as the fundamental building blocks of matter, but his ideas lacked experimental support and were not widely accepted in his time.