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2 years ago

What characteristics do the elements in a group share? In a period, share?

Chemistry

1 answer:

Katyanochek1 [597]2 years ago

3 0

Answer:

The elements in same period have same principle quantum number or energy shell.

The elements in same group shows similar chemical and properties.

Explanation:

Inn group:

The elements in same group i.e present in vertical column shows similar chemical properties.

The elements in same group having same number of valance electrons. while in chemical reaction bonds are break and formed and valance electrons are involved. That's why elements in same group having same number of valance electrons and shows similar chemical properties.

In period:

While as we move from left to right the number of valance electron increase by one in every element. But the electron is added in same shell which means that their physical and chemical properties are different but principal quantum number is same.

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Convert 2.345 centimeters cubed to inches cubed. 1inch = 2.54cm

GalinKa [24]

Answer:

0.92322835

Explanation:

0.92322835 rounded= 0.9 or 0.92

3 0

2 years ago

Read 2 more answers

A 100g sample of Carbon-14 has a half-life of 5 years. How much Carbon-14 is left after 10 years?

attashe74 [19]

Answer: The amount of carbon-14 left after 10 years is 25 g

Explanation:

Formula used :

$a=\frac{a_o}{2^n}$

where,

a = amount of reactant left after n-half lives = ?

$a_o$ = Initial amount of the reactant = 100 g

n = number of half lives = $\frac{\text {given time}}{\text {half life}}=\frac{10}{5}=2$

Putting values in above equation, we get:

$a=\frac{100g}{2^2}$

$a=\frac{100g}{4}=25g$

Therefore, the amount of carbon-14 left after 10 years is 25 g

6 0

3 years ago

What mass of each solute is present in 294 g of a solution that contains 4.86% by mass NaCl and 7.54% by mass Na2CO3

Angelina_Jolie [31]

In order to compute the mass of each solute in the sample, we simply multiply the percentage mass of each solute with the total mass of the solution. This is ad such:
Mass (NaCl) = 0.0486 x 294
Mass (NaCl) = 14.29 grams

Mass(Na₂CO₃) = 0.0754 x 294
Mass(Na₂CO₃) = 22.17 grams

7 0

2 years ago

Please I'm taking the unit test I need help

Naddik [55]

Answer:

Mechnical weathering

Explanation:

5 0

3 years ago

Read 2 more answers

Please please please help

weqwewe [10]

Answer:

See explanation.

Explanation:

Hello!

In this case, since the main molecular reaction that is taken place in the beaker is:

$AgNO_3(aq)+BaI_2(aq)\rightarrow AgI(s)+Ba(NO_3)_2(aq)$

In such a way, we understand that one breaker contained silver nitrate and the other one barium iodide. Thus, the complete molecular equations turns out:

$2AgNO_3(aq)+BaI_2(aq)\rightarrow 2AgI(s)+Ba(NO_3)_2(aq)$

Now, for the complete ionic equation, we just ionize the aqueous species:

$2Ag^++2NO_3^-+Ba^{2+}+2I^-\rightarrow 2AgI(s)+Ba^{2+}+2(NO_3)^-$

Finally, for the net ionic equation we cancel out barium and nitrate ions as the spectator one because they are both sides on the equation:

$2Ag^++2I^-\rightarrow 2AgI(s)$

Best regards!

3 0

2 years ago