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slava [35]
2 years ago
9

Help with Chemistry Thank You To Who Ever Helps Things Have Been Hard For Me.

Chemistry
1 answer:
bija089 [108]2 years ago
7 0

Answer:

1.The electonic configuration of elements and their position in the periodic table are related to each other, From the electronic configuration of the elements, we can determine the period and the group to which the element belongs

Let's consider, sodium with atomic number 11 and k, l, and M shells have 2,8,and 1 electrons. since, there are 3 principal energy levels so we concluded sodium belongs to third period M Shell(valance shell) has only 1 electrons. so sodium belongs to group 1.

2. Entire D-block elements are known as Transition Elements.

3. Group 17 is the halogen group.

4. Main group of elements are...... 1,2, and 13 through 18.

5. Group 18 are the noble gas elements .

12. a). Smaller

b). Increases

c). More reactive

d). Softer

7. a). k › Ca › Ge › Br › Kr

b). Ra › Ba › Sr › Ca › Mg › Be

9. a). Ca(calcium) ion is smaller.

b). Cl(chlorine) atom is smaller.

c). Mg(magnesium) atom is smaller.

10. a). F(fluorine)

b). Sr(strontium)

c). Pb(lead)

d). At(Astatine)

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Because copper is a metal, it is what?
oksano4ka [1.4K]

Copper is a mineral and an element essential to our everyday lives. It is a major industrial metal because of its high ductility, malleability, thermal and electrical conductivity and resistance to corrosion. It is an essential nutrient in our daily diet. And, its antimicrobial property is becoming increasingly important to the prevention of infection. It ranks third after iron and aluminum in terms of quantities consumed in the USA.


6 0
3 years ago
Does anybody know this ?
geniusboy [140]

Explanation:

density =mass/volume

density = 603/281

density = 2.1459 g/cm³

3 0
3 years ago
Which statement explains why water is classified
hichkok12 [17]

Answer: Option (1) is the correct answer.

Explanation:

Compounds are the substances which contain two or more different elements.

Similarly, water is a compound as it is made up when two hydrogen atoms combine with one oxygen atom. Compounds can be broken down with the help of chemical reactions.

Hence, the statement water can be broken down by chemical means explains why water is classified  as a compound.

5 0
2 years ago
Read 2 more answers
How many formula units are in 239.2g of <br> Br2<br> MgCl2<br> H2O<br> Fe
Oksana_A [137]

The formula units in the substances are as follows:

  • Br2 = 8.99 × 10^23 formula units
  • MgCl2 = 1.51 × 10^24 formula units
  • H2O = 2.57 × 10^24 formula units
  • Fe = 2.57 × 10^24 formula units

<h3>How many moles are in 239.2 g of the given substances?</h3>

The moles of the substances are determined from their molar mass.

Molar mass of the substances is given as follows:

  • Br2 = 160 g/mol
  • MgCl2 = 95 g/mol
  • H2O = 18 g/mol
  • Fe = 56 g/mol

Formula units = mass/molar mass × 6.02 × 10^23

The formula units in the substances are as follows:

  • Br2 = 239.2/160 × 6.02 × 10^23 = 8.99 × 10^23 formula units
  • MgCl2 = 239.2/95 × 6.02 × 10^23 = 1.51 × 10^24 formula units
  • H2O = 239.2/18 × 6.02 × 10^23 = 2.57 × 10^24 formula units
  • Fe = 239.2/56 × 6.02 × 10^23 = 2.57 × 10^24 formula units

In conclusion, the number of formula units is derived from the moles and Avogadro number.

Learn more about formula units at: brainly.com/question/24529075

#SPJ1

6 0
2 years ago
Comment on whether each of the following is a homogeneous mixture or a heterogeneous mixture: (a) air in a closed bottle, (b) ai
Colt1911 [192]

Explanation:

A mixture in which there is uniform distribution of solute particles into the solvent is known as a homogeneous mixture.

For example, sugar dissolved in water is a homogeneous mixture.

On the other hand, a mixture in which there is uneven distribution of solute particles into the solvent is known as a heterogeneous mixture.

For example, sand present in water is a heterogeneous mixture.

Comment on given situations will be as follows.

(a)   Air in a closed bottle - It is a homogeneous mixture because there will be even distribution of other gases that are present in air.

(b)   Air over New York City - It is a heterogeneous mixture because there will be presence of some dust particles, fog or smoke into the air. Distribution of all these particles will be uneven. This will make air over New York City heterogeneous in nature.

8 0
3 years ago
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