Is the earth older than any of they rock layers

Chemistry

2 answers:

Naya [18.7K]2 years ago

7 0

No because in order for the earth those layers had to be there first.

Zanzabum2 years ago

6 0

Answer:

no the rock was formed before the layers that we life on today

Explanation:

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B. Describe hydrogen bonding. (1 point)

marishachu [46]

Hydrogen bonding is an attractive force between a hydrogen atom attached to a electronegative element

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1 year ago

What does the number 18.9984 represent in the image?

Yanka [14]

The element symbol in chemistry comprises atomic number and mass number.

Atomic number is written on the top of element and mass number is written at the bottom.

For eg:

If Y is an element that is having atomic number a and mass number x. Then its denotion will be:

ᵃYₓ.

So here ⁹F₁₈.₉₉

Here 18.99 will denote mass number while 9 will denote atomic number.

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2 years ago

How are the formulas for ionic and covalent compounds determined?

SVEN [57.7K]

Answer:

Writing Formulas of Ionic Compounds

The cation is written first, followed by the monatomic or polyatomic anion. The subscripts in the formula must produce an electrically neutral formula unit.

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2 years ago

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which statement correctly explains how magnesium and chlorine combine to form magnesium chloride? A) A Cl atom donates two elect

DiKsa [7]

Answer: D) An Mg atom donates one electron to each of the two Cl atoms.

Explanation: Ionic compound is formed by transfer of electrons from metal to non metal.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here magnesium is metal with atomic number 12 and chlorine is a non metal with atomic number of 17.

$Mg:12:1s^22s^22p^63s^2$