Which statement below is not accurate about DNA? DNA is the same for all organisms within a species.
DNA is shaped like a double helix (twisted ladder).
DNA is made of sugars, phosphates and nucleotide bases..
The nucleotide bases in DNA pair up in a very specific way.

Answer:

2Al2O3  →  4 Al + 3 O2

Explanation:

Answer:

Column 1. They have one valence electron

Column 2. They have 2 valence electrons

Transition metal column. Variable oxidation states

Column 3–7. Valence electron ranges from 3 to 7 electrons

Column 8. Completely filled i.e no valence electron

Explanation:

Final answer:

Each column of the periodic table represents elements with a specific number of valence electrons. Columns 1 and 2 have one and two valence electrons respectively, and are known for their reactivity. Transition metals typically have one or two, Columns 3-7 have 3 to 7, and Noble Gases in Column 8 have a full shell of eight, making them unreactive.

Explanation:

We can categorize columns, or groups, of the periodic table by the number of valence electrons, which are the outermost electrons in an atom that participate in chemical bonding.

• Column 1: These elements, also known as alkali metals, have a single valence electron in their outermost shell. These elements are highly reactive due to their tendency to lose this electron and achieve a stable configuration.
• Column 2: These are the alkaline earth metals, which have two valence electrons. They are less reactive than alkali metals but will still readily lose their valence electrons to achieve stability.
• Transition Metal Columns: These contain transition metals which typically have one or two valence electrons, although this can be more complex due to the filling of inner d orbitals.
• Columns 3–7: Elements in these groups have 3 to 7 valence electrons respectively. Many form covalent bonds by sharing their valence electrons with other atoms.
• Column 8: Known as the Noble Gases, these elements possess a stable full set of 8 valence electrons (except for Helium which has 2). They are very unreactive due to their stable electronic configuration.

Learn more about Valence Electrons here:

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Answer:

THIS IS THE IMAGE IF THIS HELPS

Can you please provide an image it would help more than you know

Answer:

Calcium bromide

Explanation:

When naming compounds, the use of prefixes depend on the type of bond made. In this case, calcium and bromine form a ionic bond because calcium is a metal and bromine is a non-metal.

Ionic bonds are not named using prefixes. So no matter how many atoms there are, you will simply write the name of the element for the first element.

For the second element, you name it as well, but only use the root name and end it with -ide.

Answer:

C

Explanation:

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