Which of the listed properties is the same for the elements beryllium (Be), magnesium (Mg), and calcium (Ca)?

Chemistry

2 answers:

Setler79 [48]3 years ago

7 0

Answer is valence electron, they all have total of 2 valence electron.
remember group number = valence electron

Alex_Xolod [135]3 years ago

7 0

Answer: The correct answer is number of valence electrons.

Explanation:

Elements are distributed into 7 Periods and 18 groups in periodic table.

Elements that belong to same group show similar chemical properties because they have same number of valence electrons.

Beryllium belongs to Group 2 and period 2 of the periodic table.

Magnesium belongs to Group 2 and period 3 of the periodic table.

Calcium belongs to Group 2 and period 4 of the periodic table.

Hence, the correct answer is number of valence electrons.

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What element has 4 valence electrons and 5 electron shells?

marta [7]

Answer: Tin (Sn)

Explanation: The electron configuration for tin (Sn) is shown in the picture. It's last electrons are:

5s^2 4d^10 5p^2

The valence electrons are in the 5th electron shell and include 2 each in the 5s and 5p orbitals.

8 0

3 years ago

Alveoli are tiny sacs of air in the lungs. Their average diameter is 4.50 × 10−5 m. Calculate the uncertainty in the velocity of

Arisa [49]

Answer: The uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

Explanation:

The diameter of the molecule will be equal to the uncertainty in position.

The equation representing Heisenberg's uncertainty principle follows:

$\Delta x.\Delta p=\frac{h}{2\pi}$

where,

$\Delta x$ = uncertainty in position = d = $4.50\times 10^{-5}m$

$\Delta p$ = uncertainty in momentum = $m\Delta v$

m = mass of oxygen molecule = $5.30\times 10^{-26}kg$

h = Planck's constant = $6.627\times 10^{-34}kgm^2/s^2$

Putting values in above equation, we get:

$4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg\times \Delta v=\frac{6.627\times 10^{-34}kgm^2/s}{2\times 3.14}\\\\\Delta v=\frac{6.627\times 10^{-34}kgm^2/s^2}{2\times 3.14\times 4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg}=4.424\times 10^{-5}m/s$