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

Chemistry

2 answers:

Setler79 [48]4 years ago

7 0

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

Alex_Xolod [135]4 years ago

7 0

<u>Answer:</u> The correct answer is number of valence electrons.

<u>Explanation:</u>

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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gladu [14]

Answer:

$atoms \ H= 9.767x10^{24}atoms$

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In this case, considering that the mass of hydrazine is missing, we can assume it is 130.0 g (a problem found on ethernet). In such a way, since we need a mass-mole-atoms relationship by which we can compute moles of hydrazine given its molar mass (32.06 g/mol), then the moles of hydrogen considering one mole of hydrazine has four moles of hydrogen and one mole of hydrogen has 6.022x10²³ atoms (Avogadro's number); therefore, we proceed as shown below:

$atoms \ H=130.0gN_2H_4*\frac{1molN_2H_4}{32.06gN_2H_4} *\frac{4molH}{1molN_2H_4} *\frac{6.022x10^{23}atoms}{1molH}\\\\atoms \ H= 9.767x10^{24}atoms$