3 years ago

How many valence electrons does NA (11) have

Chemistry

1 answer:

slega [8]3 years ago

4 0

1 valence electron because it is in group 1 of the periodic table of elements. Which is called the alkali metals

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When a mineral was heated in a Bunsen flame to constant mass, a colourless gas that turned lime water milky was evolved. The rem

max2010maxim [7]

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3 years ago

How many atoms are present in a sample of Potassium (K) weighing 33.49g?

madam [21]

Answer:

5.158 × 10²³ atoms K

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic Table
Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

33.49 g K

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of K - 39.10 g/mol

Step 3: Convert

$33.49 \ g \ K(\frac{1 \ mol \ K}{39.10 \ g \ K} )(\frac{6.022 \cdot 10^{23} \ atoms \ K}{1 \ mol \ K} )$ = 5.15797 × 10²³ atoms K

Step 4: Check

We are given 4 sig figs. Follow sig figs and round.

5.15797 × 10²³ atoms K ≈ 5.158 × 10²³ atoms K

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3 years ago

diamond has a density of 3.26 g/cm3. what is the mass of a diamond that has a volume of 0.313 cm cubed

DaniilM [7]

D = m / V

3.26 = m / 0.313

m = 3.26 x 0.313

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6 0

3 years ago

Positive feedback is when the change caused by the stimulus is A )decreased B) changes constantly C) nonexistent D) Increased HE

polet [3.4K]

Answer:

c) nonexistent

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4 years ago

An ion has 14 neutrons, 10 electrons, and a mass number of 27 what element

nasty-shy [4]

The ion is Al³⁺

mass number - number of neutrons= atomic number

27 - 14 = 13

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3 years ago