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A certain atom has an atomic mass of 19 and atomic number of9?

a. How many protons does it have?

b. How many neutrons does it have?

c. Using a periodic table, what element is this?

d. If its charge is +2, how many electrons does it have?

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Lelia Lubowitz
Lelia LubowitzLv2
29 Sep 2019
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Related questions

Which of the following is true?

A. Atomic weight is determined by the number of electrons in an atom of a given element.
B. Atomic weight is determined by the number of protons in an atom of a given element.
C. The reactivity of an atom is based on the number of electrons in its outer valance.
D. The chemical reactivity of an atom is based on the overall number of electrons in the atom.

Thanks.

1. An ionic bond between two atoms is formed as a result of the ______________.

a) sharing of electrons

b)transfer of electrons from one atom to the other.

c) loss of electrons from both atoms.

d) loss of a proton from one atom

2. Choose the phrase that best completes this sentence: Microtubules ____________ and are required to pull duplicated chromosomes to opposite poles of dividing cells.

a)generate contractile forces

b)are intermediate in thickness

c)are found in especially large numbers in muscle cells

d)can rapidly reorganize

3. Which subatomic particles contribute to the atomic number for any given element?

a)protons

b)neutrons

c)protons and electrons

d)protons and neutrons

The element nitrogen is found in the second row of the periodic table and has an atomic number of 7. how many electrons must nitrogen gain in order for its valence shell to be full? The answer is 3 but what's the concept behind this?

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