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3 years ago

Which of the following elements has the smallest atomic radius?

Chemistry

2 answers:

Yuliya22 [10]3 years ago

8 0

Answer:

helium is the smallest element and francium is the largest

erastova [34]3 years ago

6 0

Answer:

K+ is the right answer

Explanation:

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The enthalpy of combustion of hard coal averages -35 kJ/g, that of gasoline, 1.28 x 105 kJ/gal. How many kilograms of hard coal

Ganezh [65]

Answer:

3.657 kg

Explanation:

Given:

Enthalpy of combustion of hard coal = -35 kJ/g

Enthalpy of combustion of gasoline = 1.28 × 10⁵ kJ/gal

Density of gasoline = 0.692 g/mL

now,

The heat provide 1 gallon of gasoline provide = 1.28 × 10⁵ kJ

and,

heat provided by the 1 gram of coal = 35 kJ

1 kJ of heat is provided by (1/35) gram of hard coal

therefore,

For 1.28 × 10⁵ kJ of heat, mass of hard coal = 1.28 × 10⁵ kJ × (1 / 35)

For 1.28 × 10⁵ kJ of heat, mass of hard coal = 3657.14 grams = 3.657 kg

3 0

3 years ago

Why is it easier to remove an electron from a sodium atom than a magnesium atom

gulaghasi [49]

It doesn't take much energy to remove one electron from a sodium atom to form an Na+ ion with a filled-shell electron configuration. The first ionization energy of magnesium is larger than sodium because magnesium has one more proton in its nucleus to hold on to the electrons in the 3s orbital.

5 0

3 years ago

hydrogen-2 is also known as deuterium as well as hydrogen-3 is known as tritium hydrogen-1 is our common hydrogen isotope a samp

UkoKoshka [18]

H-1 only has 1 proton and 1 electron, so its mass number is 1.
H-2 has one more neutron so its mass number is 2
H-3 has one more neutron than H-2 so its mass number will be 3.
average atomic mass = 1 x 99% + 2 x 0.8% + 3 x 0.2%
=1.012

6 0

3 years ago

What's the velocity of a ball falling with 100 joules of kinetic energy and a mass of 2 kilograms?

FinnZ [79.3K]

Answer:

Explanation:

kinetic energy of linear motion

$k.e = \frac{1}{2} m {v}^{2}$

kinetic energy, K.e= 100joules

mass, m = 2kg

velocity, v =?

substituting the values into the formula :

$100joules = \frac{1}{2} \times 2kg \times {v}^{2}$

${v }^{2} = 100$

$v = \sqrt{100 }$

$v = 10m { \sec }^{ - 1}$

3 0

3 years ago

Determine how many subatomic particles are in the following days

ololo11 [35]

Answer:

Number of protons in Na²⁴ = 11

Number of neutrons in Na²⁴ = 13

Number of electrons in Na²⁴ = 11

Number of protons in I¹³¹ = 53

Number of neutrons in I¹³¹ = 78

Number of electrons in I¹³¹ = 53

Explanation:

Sodium is present in group one.

Atomic number of sodium is 11.

Its atomic mass is 23 amu.

Electronic configuration:

Na₁₁ = 1s² 2s² 2p⁶ 3s¹

Number of protons in Na²⁴ = 11

Number of neutrons in Na²⁴ = 13 (24-11= 13)

Number of electrons in Na²⁴ = 11

Iodine:

Iodine is halogen element.

Its atomic number is 53.

Its atomic mass is 127 amu.

Electronic configuration:

I₅₃= [Kr] 4d¹⁰ 5s² 5p⁵

Number of protons in I¹³¹ = 53

Number of neutrons in I¹³¹ = 78 (131-53= 78)

Number of electrons in I¹³¹ = 53

6 0

3 years ago