3 years ago

Where are elements with atomic numbers 1 and 2?

Chemistry

2 answers:

Maru [420]3 years ago

5 0

Answer:hydrogen(H) is 1 and helium(He) is 2

hydrogen is a nonmetal and helium is a nobel gas. hydrogen is found in group S and helium is found in group P

Explanation:hope this helps

rusak2 [61]3 years ago

5 0

Answer:

1 H Hydrogen 1.00797

2 He Helium 4.00260

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Fed [463]

Answer:

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Explanation:

7 0

3 years ago

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Nimfa-mama [501]

Answer:

$\boxed{\text{254 g}}$

Explanation:

$\begin{array}{rcl}\text{\% m/V} & = & \dfrac{\text{Mass of sucrose}}{\text{Volume of solution}}\\\\\text{Let m}& = &\text{mass of sucrose}\\\dfrac{\text{35.0 g}}{\text{100 mL}}& = & \dfrac{m}{\text{725 mL}}\\\\m & = &\dfrac{\text{35.0 g}\times 725}{100}\\\\ & = &\textbf{254 g}\\\end{array}\\\text{You need $\boxed{\textbf{254 g}}$ of sucrose}$