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4vir4ik [10]
2 years ago
7

Write the atomic number, atomic mass, number of protons, electrons and neutrons for the first five elements

Chemistry
1 answer:
stepladder [879]2 years ago
8 0

Answer:

The first five elements of the periodic table are:- hydrogen, helium, lithium, beryllium, boron

Explanation:

atomic number- it is represented by the letter Z. It is basically the total number of protons present in each atom's nucleus of that element.

atomic mass- is the mass of a single atom present in the element.

electrons and protons- they are negatively and positively charged particles found in the nucleus of the atom respectively.

neutrons- they have no or zero charge and weigh more than protons.

element | atomic number | atomic mass | electrons | protons | neutrons

hydrogen (H)-         1           |     1.008        |   1             |     1         |  0

helium (He) -          2           |     4.0026     |      2         |      2       |   2

Lithium (Li) -           3            |      6.94        |       3        |       3      |   4

beryllium (Be) -       4           |      9.0122    |      4         |        4     |    5

Boron   ( B) -            5          |       10.81       |       5        |         5    |     6

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What type of change is the following: striking a match chemical, or physical?
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3 years ago
What do you call each of the following changes of state:
Alinara [238K]

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8 0
2 years ago
If you have 1.1 moles of magnesium nitrate then how many grams is that
marysya [2.9K]

Answer: 162.8 grams

Explanation:

Magnesium nitrate has a chemical formula of Mg(NO3)2.

Given that:

Number of moles of Mg(NO3)2 = 1.1 moles

Mass in grams of Mg(NO3)2 = ?

For Molar mass of Mg(NO3)2, use atomic mass of magnesium = 24g, nitrogen = 14g, oxygen = 16g

Mg(NO3)2 = 24g + (14g + 16gx3) x 2

= 24g + (14g + 48g) x 2

= 24g + (62g) x 2

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= 148g/mol

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Mass = 162.8 grams

Thus, there are 162.8 grams of magnesium nitrate.

3 0
3 years ago
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