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3 years ago

An atom has a mass number of 9 and 5 neutrons. What is its atomic number? A 19 B. 14 O c.4 D. 11 SN

Chemistry

2 answers:

nika2105 [10]3 years ago

5 0

Answer:

$\boxed {\boxed {\sf C. \ 4}}$

Explanation:

First, define some important terms.

Mass number: the sum of the nucleons (protons and neutrons)
Atomic number: the number of protons

We know the mass number is 9. So, the sum of protons and neutrons is 9.

$mass \ number =9$

$protons + neutrons = 9$

We also know the atoms has 5 neutrons. Therefore, the rest must be protons.

$protons + 5 \ neutrons =9$

Subtract the 5 neutrons from the overall mass number of 9.

$protons = 9- 5 \ neutrons \\$

$protons=4$

There are 4 protons, so the atomic number is also 4. This atom is beryllium.

butalik [34]3 years ago

4 0

Answer:

C. 4

Explanation:

the mass is the number of neutrons and Protons. so if you have 5 neutrons that means the rest are Protons... and the number of Protons is the Atomic number meaning the Element number... Beryllium is the element :)

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4 years ago

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3 years ago

1. Which statement is accurate?

valkas [14]

1. Answer:

B) An allele is one form of a gene.

Explanation:

An allele refers to an alternative form of a gene. In other words it is one of the form of a gene.
A gene may have two alleles, where one of the allele is a dominant allele and the other is a recessive allele.
A homozygous organisms may be dominant or recessive, a homozygous recessive contains two recessive alleles while a homozygous dominant contains two dominant alleles.
A heterozygous organisms contain one dominant allele and one recessive allele.

2. Answer;

B) Alleles

Explanation;

According to Mendel genes are inherited in pairs of alleles that behave in a dominant and recessive pattern.
Alleles are alternative forms of a gene.

A gene may have two alleles, where one of the allele is a dominant allele and the other is a recessive allele.
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4 years ago

The table below lists three characteristics of an atom of an element

ahrayia [7]

It’s Neon (Ne)

Explanation
Neon has 10 protons, and 10 neutrons.
How to find neutrons:
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Valence electrons are the number on the last shell of energy level, with is 8.
But a easy way to find it is by looking at the group number, the last group number in case 18 only focus at 8. Questions?

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2 years ago

An atom has a mass number of 9 and 5 neutrons. What is its atomic number? A 19 B. 14 O c.4 D. 11 SN​

An atom has a mass number of 9 and 5 neutrons. What is its atomic number? A 19 B. 14 O c.4 D. 11 SN